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The 'choose your Feats' thing is cool, but I'd consider saving it until a certain level and then allow the Fighter to pick a single Feat as a swift action once / day. (I like the swift action idea because I see this sort of thing like Wesley in the Princess Bride, saying to the swordsman that he also happens to be right-handed. It's not magic, it's just the Fighter remembering a style / technique he saw back in 'Fighter school.')
Variations on this idea;
1) The fighter gets one of these 'open' feats every four levels. (4th, 8th, 12th, 16th and 20th). Each use as a limited duration (1 minute?).
2) The fighter must have all prerequisites for the feat in question. (Will encourage a Fighter to pick up a lot of 'gateway' feats like Combat Expertise and Power Attack, so that he can take the others as open feat options).
3) The Fighter only gets one of these open feats, right at 1st level, but can swap it out once per day per five Fighter levels (so at 5th level, he'll be able to change it again later in the day).