I was thinking it'd be cool if warriors had a sort of a combo point system, except instead of being put on a target, a combo point would be added to a counter on the warrior himself (say, every time a special attack is used). More combo points could either improve current abilities or unlock new abilities the more combo points you have.
Combo points are used up when you perform one of those abilities requiring combo points.
It would add a lot of fun to the warrior mechanics.
I know it's too late at this point for something like that to be added into the game as it would require a full overhaul of the warrior class and warrior balance, but I think it's an interesting idea.