You can add randomized races while setting up a game.
Yea, but these can cause collisions between them and major/minor already defined fractions. While handy, 16 people is still not enough.
Then. The randomized factions
replace the existing ones. Game won't take more than all factions + 1 random.
Oh and it doesn't "generate" races, it just randomly choses one.
But those are boobs... many of them. I'm not misogynist. I like who regular man like, but still. I'd like to play and not be concerned by floating table.