how about an idea of combo moves.. like in the DBZ games for SNES or playstation, you have to press a series of directional buttons combined with either the punch or kick button to do a combo move..
with the new melee, if you guys are a few feet away, you do for instance lets say left back right + kick for gokou would do a 5 kick combo move! u move mouse in the direction of the enemy, and if the first kick connects, the enemy would sorta b stuck till the combo is over, unless he can counter with another move.. or he can just press the block button and wait till the combo is over..
with the combo move maybe like the the games, gokou can have that fast lightning kick from the air with some ki put into the attack! and like for buu, if u wanted to do his punch from underground or throw a piece of his body at you, u have to press a series of buttons then either the punch or kick button and he does the move