The spice of the Freelancer lore is purely based on the holes it left open. There really is no place for anything than humans, psionics, maltese, clones, cyborgs, nomads and robots in this franchise. If you want more, play Star Wars and Star Trek, but don't try to put those things into Freelancer.
The best thing about the Daam Kvosh is that they aren't there and won't return. The same goes for the mystery about Sol; the things beyond the hypergate; the cause of the Daam Kvosh departure/disappearance and so on. Most people already complain about the way the Nomads are portrayed, and even more people complain about how stupid some human factions are portrayed. Adding more aliens to that won't do any good to Discovery. The most alien thing we have is Gallia.