Wow, I was just starting to make a similar class. Full BAB - Dexterity & Charisma based (There really should be more Charisma based classes that are not spontaneous casters).
Now, seeing how cool this looks, I'll probably not bother! So I'll just give ideas and annoy people in general.
How about adding Force of Personality as a bonus feat somewhere? It sure fits the fluff. Or something to leave a mark in an enemy, in the best zorro style, which in turn, grants a morale bonus for the swashbuckler against said enemy? Maybe on a critical or something
EDIT: Nevermind, just noticed Dashing Soul works just like Force of Personality!