hong,
Fits in nicely with Indomitable, but I would lower the bonus to +1 to hit, but not damage. Then it would be toned down to a sort of "super weapon focus", which is still pretty strong.
By the way, about this particular strategy to make CHA less of a dump stat for meleers... aren't we just throwing bones to the paladin here? Making CHA comparable to INT and WIS for meleers is a good idea in principle... except that everybody needs attack and damage bonuses, and so the paladin is simply reaping the benefits with little sacrifice. That bothers me.
What about a series of CHA feats that would be... I dunno, useful in combat, but somehow orthogonal to adding direct bonuses to hit, damage, and AC? For example, bonuses to saving throws that stack with Iron Will and its siblings. (You too can play that extremely lucky halfling fighter.) Or maybe minor fear effects, or minor "rally the troops" effects. Basically some avenue of specialization that provides an interesting style or flavor, kind of like the Expertise line.
Call to Battle [General, Fighter]
Your heroic fighting spirit spurs your comrades to action.
Prerequisites: BAB +1, Cha 13+
Benefit: At the start of battle, you and any creatures who view you as an ally, are within 30 feet of you, and can see you gain a +1 morale bonus to their initiative roll. This benefit is lost if you are stunned, helpless, unconscious, or under the influence of a fear effect.
I dunno, something like that.
Edit: added "you" and "morale bonus" to the Call to Battle feat.