I mean, why not?
Feats are all they have going for them, so they should get some no one else does.
Here's an example:
Not Dying Yet (Fighter Only)
Prerequisites: Diehard, Constitution 19
Benefit: A fighter may continue fighting long past the point that he was paste on the floor. A fighter with negative hitpoints may continue to act as if he was unharmed as long as he can succeed a Fortitude Save with a DC equal to the number of negative hitpoints he has; he gets half his levels in fighter as a bonus to the fortitude save, and does not add any of the bonuses to your fortitude save that you would derive from any non-fighter levels you have (i.e. bonuses from magic items)
Special: You may only take this feat as a fighter bonus feat.
So, basically useful for fighters, useless for anyone else.
(I think I made the example a little too much, but you get the gist of what I'm suggesting.)
Questions, comments, concerns, pie?