Holy crap, Theo this is so amazing O-O will surely add flavor to battles ^~^ I guess this feature can make a skill like this:
Player approaches the enemy and readies a slash with his greatsword, exclamation balloon pops in, Press Z to Slash upward reducing AGI, press X to slash in the middle to reduce DEF, slash downward to reduce ATK xD. A skill that branches on different keys to different combos will be extremely fun to play with ^~^