I looted a rule from Conan D20: Bonus Skillpoints from Race(e.g. Human), Feats(I know of 2: Open Minded & Nymph's Kiss) or High INT always buy 1 rank, even crossclass
Also I changed from the usual table to 1 Feat every other Level(1,3,5,7,9,11,13,15,17,19).
So far my players have reasonably used this to enter PrC, or to take otherwise neglected feats.
My Monsters also get additional feats, so the Power Balance is pretty much the same as without houserules.
The Banhammer hits only depending on Campaign/ mutual agreement with all my players.