Is it possible to eliminate all possible starting races? How would that work with sector generation?
I have managed to eliminate most starting races (except for the artificial ones) while not allowing anyone organic to emerge. The new sectors were only containing the remaining races.
I have no idea what would happen if I eliminated the remaining races. Maybe I'll try it.
Does the resurrection quest actually bring back extinct races?
Does the resurrection quest cause races to "emerge" in the galaxy?
If so, does that work only with races you have unlocked?
No, you can resurrect a race you have never seen before, and thus unlock it. As a matter of fact, this is the only way I have found to unlock some sub-races.
Can it work on sub-races at all?
No good deed goes unpunished...