Interesting idea....but actually if you think about it, I'm not sure how well it would work. After all, since it uses WM+, theoretically you would have to have a mote in each hand, and you would also have to be able to simultaneously control your actions in each hand, which is dually more difficult than controlling a sword in one hand.
If it were a customizable, extra option then I believe that would be alright since it would not be required throughout the game, but if it were the main feature then I don't think it would work for a lot of people.