Imagine scorpion's or (any other character's) custom hapkido attacks that can be buffered with running grapples. Grappling of course can mean different things; Scorpion could either break or throw his enemies. Or the player can break the grapple and retaliate. It could add variety to MK's gameplay than just plain old kicks and punches. I think that it's time that fighting games give us something new. I'm bored with just kicks and punches.

Also: aerial fighting would be great for MK. Think about Raiden as NEO and Scorpion as the chinese guy in RELOADED.