Hehe. I am near the 2000 views. Here are a few more random ideas to extend the current ones:
1. Biohazards. Well it is a bit harsh abbreviation of non-human races, but I brainstormed a few race before which are not necesseraily humanoids. Or even their presence can make sick other races . Maybe their anatomy is different as well ((ike breathing different gases, different enzym systems, different energy reproducing ways), so we can explain different "skills" with biochemistry through evolutions on different planets. And that is the reason I talked about why an ideological conflict could escalate in the Milky way. Not just because somebody hasn't emptied the bin, I believe our future "ecoterrorist" enemy would be more serious about it. Isolationist Or unionist shall be a civilization? Shall they leave their biological mark on other planets or not (for example: to be afraid of contaminating an other world vs. directly spreading our own biological marks there)? Which side is right in a long term of evolution? So that is the reason I have said that SG should not be only about bigger and bigger spaceships, bombs and shields. I believe a new SG spinoff should stronly build on visiting alien worlds, new ecosystems, remain human in inhuman conditions etc.. But unfortunately if we open the stargates we can never know if we don't kill the locals even with a little sneeze on the other side or if our world won't be contaminated with something nasty when we come back... So that is the reason I believe we could tell so many intelligent stories and ethical dilemmas through a biology oriented main character. For example Try to imagine the local Jurassic parks! Not dinosaurs of course, but what if the Ancients moved such plants and races to different worlds (because of the Ice Age) which died out with the spreading of humans on Earth? It could be interesting to see such animals on a few isolated worlds.
2. I have rewatched the Harsiesis related storyline. I believe something is still missing from the timeline. What could happen with the Goa'uld why they don't want to remember their past crimes? They are evil anyway, so what can be even worse than them? There must have happened some serious events, but unfortunately the SG shows have never really explored this area of their past. I have imagined a little quick backstory. We know that they were taken the Unas as hosts. Then maybe some other visitor race was also taken as host so they could leave their planet through the stargate or some spaceship. Maybe The Great Alliance has seen a great potential in them as they wanted the "good" Goa'ulds to look after and guide the human worlds while they were escaping to the Pegasus galaxy. That is the reason they were named as System Lords, as literally one Goa'uld was guarding one solar system. Maybe the Great Alliance has already fallen apart that time and this step looked like a good idea as they Goa'uld hosts looked immune to the brain infection, but no Ancients was willing to unite with them, I don't know. They were spreading and they could controll easily most of the galaxy. There were complete worlds where everyone were Goa'uld! Then they have meet an alien race on a distant world who wanted to stop them and they rebelled against the Goa'uld rule. The free Titans have used advenced technologies (like laser firing satellites), but they couldn't defeat the complete Goa'uld as there were so many of them and they infected so many races in the galaxy. One of the minor Goa'uld Queen (Mnemosyne - goddess of memory and in this case literally the genetic memory) made a biggest evolution jump for the Goa'uld. She has taken a Titan as a host. She learned that host and the symbiote can share memories and experiences, so these essential information can be coded into genetic memories. They learned all the technological defences of the Titans this way, so more and more Goa'uld wanted a Titan host as they were jealous to each other. The Titans were really effective enemies in the past and most of the Goa'uld worlds have been wiped out easily. What Mnemosyne and the other Goa'ulds couldn't know that the Titans decided to have an evil long term plan how to defeat the Goa'uld society from inside. They artificially engineered Titan bodies which directly sacrificied themselves as hosts, so the first Titan was misleading Mnemosyne (her host name was Gaia). We know that the Goa'uld Tel'chak (Mayan rain god from the season 7 Evolution I-II) found that cube like device in 900BC which helped to create the first Goa'uld sarcophagus what ruined the souls of the Goa'ulds. The Titans directly wanted the Goa'uld to find it, so while the Goa'uld could heal themselves, now they could heal their vulnerable aliens hosts as well with the cube. Later the developed sarcophagus technology what looked very-very adventageous in a galaxy wide war. The proud Goa'uld haven't realized the side effect of the technology in time. They became more and more depent on the Titan technology as every Goa'uld wanted to live forever. They became more and more suspicious and hostile to each other, while the genetic memories made sure that all the future generations of the Goa'uld were the same as well. They almost killed each other completly as they were fighting for more and more power. Not to mention that they symbiontes became parazites. Unfortunately the other side effect of the technology was that their life can be only extended if they were consuming other Goa'ulds, so that is how the cannibalism started. Meanwhile the Goa'uld Ra discovered the Tauri, where they found a new, easier controllable host race : the humans. Most leaders of the Goa'ulds all changed to human hosts as this race looked perfect to repopulate the galaxy under their own terms and they killed most of the earlier host races. (The legends would come from here as the first generation of gods in Titans bodies, then the rebellion of the Titans etc.) The Goa'uld made an agreement that the Queens should not pass the Titan DNA to the future symbiote generations. They couldn't control the reproductive system of their own human hosts, but at least they could completly control their bodies not like the earlier host races. So they also discussed they will not allow of two Goa'uld humans hosts to have a common child (the Harsiesis) as even the human hosts were carrying some part of technological memories in the Titans DNA (in the quiet part of the human DNA) what was more stronger if it was doubled in the DNA of the common child. Some Goa'uld tried to use the Harsiesis as hosts, but they couldn't complete control on such hosts and they became completly mad (as a genetic revenge of the Titans), so most of them have rather abadonned and killed the forbidden childrens. Even these became such myths what they never ever talked about again. So eventually the Titans were defeated and a few survivors were imprisoned, but their mission was basically successfull. The mind (and the genetic) of the Goa'uld was infected forever and even the Queen couldn't stop of spreading it. They never tried to take a Titan as a host again. An advanced and safe human host was always a long term plan of the Goa'uld. They really made them dependent on the sarcophagus technology and their numbers greatly decreased because of the civil war and the cannibalism. What the Titans haven't calculated in that millions of humans suffered from slavery and Goa'uld civil wars because of their genetic memories and revenge.
I know it is not the most exciting mini-story, it is just a quick improvization. We know that even Ra has had a strange alien host, maybe that was the reason he could gain power as he was the one of who found Earth and the humans. Mnemosyne could be left out completly and he could be the one who has taken a Titan as a host, but Ra has never been a Goa'uld Queen as he had Hathor, so it would look a bit odd how his actions had an effect on every other Goa'uld around him. I know I don't have to expalin everything all the time, just I don't like plotholes.
And we should explain what happened with the earlier humans in the galaxy? Were they all Ancients? Or have all of them died out / ascended / escaped? What if Ra's host was a Vanir (see the small flashback at his death in the Stargate movie)? What if they wanted to ruin the Alliance with the viral infection of the Ancients? That would be also a big revelation that they have been manipulating even the biggest races for a while now.
I guess the writers of SG shows haven't dug themselves into biochemist, but if two Goa'uld human hosts can pass genetic memories to create a Harsiesis, then it means that the Goa'uld host bodies are directly passing genes to future generations. So maybe a Goa'uld host could supress the "genetic memorial poison of the Titans" and they could kill all the Harsiesis, but what if they fathered a child with a "normal" human? It means that every descendant of active human hosts could carry such DNA sequences which are part Goa'uld or Titan. And that means lots of affected people in the galaxy. That would be an interesting new "genetic" discovery (for example the Ashen could extract some Goa'uld memories to gain new gate addresses and that how their story as a hostile galactic civilization could start...) You know the human DNA has got lots of quiet genetic sequences / parts which are not used for anything in our body, but it is still being copied to every cell. It is like an evolutionary heritage, but these part of the DNA never used to synthetitize any proteins (what is needed for enzyms). Or if you have seen how an embryo develops, then there is a stage when all humans had a little tail like body part like a genetic heritage from the reptile times, but then this tail disappears within a few days. I hope you can still follow me. Imagine it like copying a book all the time, but everybody would put an empty page in without informations, then soon it or later most of the book would be empty and just a small portion would be really useful. So my idea would be that if the Goa'uld had genetic memories about earlier host races, then maybe it was accidentally given to human descendants. And don't forget that even the Ancients coded their precious high-tech stuff with genetic coding. There must be a really good reason why the Goa'uld has never found this "biological key", maybe it shows up on Earth as a gift from Merlin or whatever.
But as we talked about the Titans before, unfortunately Cronoss was used as a Goa'uld Systemlord. It could still happen that he was a leader of the Goa'uld who managed to defeat and to lock them up, but he has kept his Titan's host name as a reminder of his victory. But then Ra became the supreme leader as he could find the humans as future slaves.
And the uncanon sourcebook also mentioned that the homeplanet of the Nox is called Gaia. Well.. That will be a bit hard to explain, but I can try to find a reason. As you can see I am capable of connecting the existing informations.
edit. I have rewatched the Evolution I and II where they stated that according to Nick Ballard Telchak's device had Ancient origins. So maybe the Titans were a group of Ancients who wanted the Goa'uld to guard the solar systems. Or maybe Nick Ballard was wrong. It would be nice to hear a deeper Giant Alien story anyway what could explain why was Hathor locked up in Latin-America. Maybe she was looking for the device for herself? She had her sarcophagus in her tomb, so it must have happened after the discovery of sarcophagus technology. Zipacna was also introduced. They even had Chalchiutlicue as a Goa'uld in 3x05 Learning Curve. Hmm interesting. The SG timeline is full legends and mysteries.