airwalkrr said:
It is almost universally accepted that the fighter in the core rules is a somewhat weak class, good for dips, but not usually worthwhile in the long run.
First a small critique: I would have personally preferred that you used a more balanced wording. "Almost universally accepted" based on what? If you think about it, you can't honestly deny that there are many many gaming groups which play with the core rules and don't have any problems with that. Are we casual gamers? Maybe yes

But also there's *lots* of gamers which aren't so casual and give game balance some dedicated thoughts, and still don't agree that the core FTR is weak. Actually there are even people in this forum which believe the opposite. Maybe you're even right, maybe really the majority think it's weak, but please don't try to boost your opinion with such an expression...
Please don't take this personally
airwalkrr said:
Some people have suggested more bonus feats as a way of helping giving a little more incentive to play the class, usually to the tune of one bonus feat each level.
It's obviously an incentive to take some levels of FTR, but I am not sure how good an incentive is on the long run. For a "dipper" it could be an incentive to continue as FTR, but for someone else it could even be an incentive for dipping, if they were planning NOT to dip.
airwalkrr said:
Well, I just now hit upon a great idea that finds a happy medium between the two. Take a look and tell me what you think.
Definitely a great idea, these bonuses are not as large as feats but they are indeed useful to either specialize your FTR or "round it out". I think you nailed the issue: to make it attractive to stay within a class, the class must offer something
unique and otherwise unavailable to the other classes.
Keep posting other example benefits as soon as they come to your mind. Maybe for inspiration you could check out d20 Modern, where I think that every class has something similar called Talens (tho honestly I don't know if they are really compatible in terms of balance...).