I love the way AoI changed the flow to melee with just attacking and the just countering. It changed the game from the button mash fest to something requiring a bit more... focus, I guess.
Anyway, I would love a similar change on the teching side. "Just-casting" sounded mildy craptastic, but what I think would be cool is the ability to hold down a button and "over-charge" a tech, specifically the basic, gi-, and ra- techs. Holding down the button would consume more pp obviously, but hit substantially harder, say, up to 2x depending on the length of time the button is held down.