But playing against multiple different species is kind of a core concept for this game, i don't think we'll be adapting a such a diaspora as the core game set-up.
BTW i don't understand how somebody somewhere inventing FTL starts a massive race for the stars. If the inventors are in competition with everyone else, why give away the secret of FTL? No one else would know about it until they arrive in overwhelming force in super-duper FTL ships.
That's a fairly good question.
I know that many sci-fi books use FTL communication done via spin-aligned quantum electrons in addition to actual FTL, so that dispersal of information is done more rapidly than dispersal of ships. While the technology wouldn't be given away, the research behind it would undoubtedly be shared and easily leak out and it would be a short hop to turn theory into practise by those that can. I'm sure that one's played out in some books I've read, though I can't think of any right now.
In the Honor Harrington series I described, things don't happen that way. As far as I know, the government of Sol don't bother to keep the information from private hands, so interstellar trade quickly takes off as companies build their own merchant marine and the technology travels outwards very rapidly in peaceful trade (most first contacts being private traders and not governments), making the Sol system filthy rich and very powerful but lacking any monopoly on the technology. Additionally, due to uncharted space hazards, the early days are very dangerous and FTL travel doesn't take off properly until scanners catch up with the drives and most hazards get mapped (usually by ships not coming back), meaning that the technology's around a lot longer than it's truly useful to use. One particular group are particularly far-sighted and set up a slush fund on Earth in case it gets invented while they're travelling, and so buy their own FTL ship, as well as any emergency supplies they need once they set up a colony (in this case, the original colonists are blessed with a very terrestrial world that adapts well to them - so well the local diseases jump over to them and start killing them, so they need emergency supplies and fresh colonists).