So that's done. Then we have to deal with things like Power Attack and Combat Expertise. First, they shouldn't cost feats. Making them accessible to all characters is a good way to give everyone more options, right? Second of all, they should be more functional for characters who spend feats to specialize in them. Third of all, things like Power Attack shouldn't punish characters who use a shield: make returns for using Power Attack equal for everyone.
Well, you certaily could go that route. Get rid of fighting defensively, and allow everyone to use Combat Expertise in its place. You could also allow anyone to Power Attack with a non-light weapon. Really, all this does is free up a feat for melee characters anyway, as they would have blown a feat on it, and any non-full BAB classes will see relatively little benifit (a cross between having a lower BAB and not always using two handed weapons).
If you want feats to boost it, perhaps a feat to improve your Power Attack ratio could be in order. Maybe you could make a Frenzied Berzerker's Improved Power Attack ability into a feat. Perhaps Supreme Power Attack could be made into a feat as well, but this largely devalues that class.
Although, doing something like this doesn't change a whole lot in my opinion. Basically, what I'd see happening is:
1) All melee PCs would take these feats.
2) No one would take levels in FB.
3) The damage output would improve, but that's never been a melee PC's short fall. They just get better at doing what they already do well.
I'd say if you want to run a ToB-less game that gives combatants options, I think you're on the right track with a list of tactical feats. Make some ones easier to qualify for at low levels, and perhaps give out some bonus tactical feats at key levels to various classes.