I don't have a comment on the DFA 'cause I think Art's idea was the best one posted.
However, I don't think the backspin should be spinnable for the same reason the blue lunge shouldn't be aimable; the feet are planted in one place during the animation. I just doesn't look right for the backswiper to be spinning in place. However, something does need to be done to give the move more benefit. As is, there's almost no point in trying it.
Someone also mentioned that knocking someone down is useless because the knocked down person can get up right away and also push people while on the ground. However, they forgot that you can toss your saber at someone you just knocked down and they can do nothing to block it. So it's not useless.