Yeah, it's just hard, for me at least, to figure out the "worth it" part of that equation. Although I think I posted to that effect already.
Perhaps you could just give people bonus feats for pre-req ones, or ones w/ few requirements. Sure, some of those are good -- power attack is nice, spell focus and penetration aren't the worst things in the world -- but many of them suck, like the aforementioned dodge, and you probably won't have a build hinging on them.
