Hmmm, not to down play Iajutsu Masters... but:
Strentgh of Purpose (general)
You can channel your 'aura' into devistating strikes.
Prereq: Str 13+, Cha 13+, BAB 5+
Benefit: You may add your charisma modifier to your melee attack and damage damage roles a number of times per day equal to your character level.
Yeah I know alot more useful to Paladins and Clerics, but it is all I can come up with...