Argyle King
Legend
Judging from what has happened in the past, the real beauty of feats is that they can be anything: adding a constant bonus, adding a new ability, changing or enhancing an existing ability, allowing you to exchange an existing ability for something else, etc.
Where they get ugly is when you have to choose between a bonus (which helps you stay relevant in combat at a given level) and something you think is cool/flavorful.