Before she left or took a break CuteUnit was working on a mod detailed in http://www.gamesas.com/index.php?/topic/1064982-wipcutemelee-meets-fist-of-the-north-star/page__p__15472020__fromsearch__1entry15472020 that had the player punching really fast. There's a video (or a couple) in that thread showing it. Not sure if she mentioned how she did it.
I don't know the answer, but thought that thread may be helpful in some way

Edit: I was replying to the first post.