[PvK]

Combat bonus can of course be set as you please. Some primitives might be good fighters, others not.

Giving some of them plague weapons would be trivially easy. If you want to create some which have built-in infection abilities that aren't entirely intentional, that'd be pretty easy too. The problem is, if they're neutrals, then the only thing they could infect would be colonies in their own system, and only if they had some spaceflight ability. I guess you could also give them some plague causing intelligence missions, which would represent your own traders spreading their diseases to your systems. In Propotions, this could be quite disastrous!!!

PvK