Wrex, I would suggest staying away from antifeats -- they're near TO. But anyway you as DM roll d1000 20 times to assign "antifeats" (which are literally what they sound like, for example the Improved Initiative antifeat gives -4 init) at random to a PC. Then for every 2 antifeats they have they gain a bonus feat.
The antifeats a PC gets could be completely irrelevant to them.