Good idea but... nah!
Its a good idea but the control stinks. Why people keep forcing to move your character in flash games with the mouse only?
Seriously, you have to allow to have play with the keyboard too. Don't you see that some times when the mouse go "outside" the animation area you lost control of the game completely? Just think about it for a moment.
By the way, that "handling" thing is annoying and confusing, specially with the mouse control.