No, it's actually possible, engine wise. Even a hundred of NPCs is doable (direct quote from one of the old Freeworlds devs). Unfortunately Disco's got a bit of short end of the stick when it comes to the coding department currently, as the golden days of FL coders are long gone, and the people who would be able to do it here presumably don't have time or incentive for such a gargantuan effort and potentially very little payout:
