[N E S T E A]

I have a interesting ideea for you.
instead of making the ball always constantly moving without losing speed ,why dont you make it so the ball is on the bottom of the screen and when u press the dpad,up. the ball slowly moves, as you would apply pressure on it. and then let it drop and have life like physics.
or make this into a game. have you ever played iphysics in sandbox mode? its awsome. its a sandbox. and u touch to make balls,shapes.....etc. and they all have gravity. but if you double tap the screen(pad in our case) the objects spin like on a axle.

..... complicated? ...yes
cool? ......very
IF possible, give that a shot.