That seems like it would throw me off more than it would help.
As is, I see an enemy x distance from the crosshair, and I know at 5.33 sensitivity I need to move the mouse y distance across the pad to aim at him.
With that thing, you'd have to regress the aim in your head, constantly thinking about moving the pointer towards the target, stopping over it, then pulling the trigger. Too much thought, it'd totally kill your twitch.
No thanks, I'll take my 500mx.