I think playing spinner games with a trackball - or a mouse - is about as fun as playing trackball games with a joystick.
It works, but you know its not the same.
Now... you might not care, it depends if you like those games a lot, or a little.
Having a frankenpanel might not be better then having sucky controls on games you barely play.
If you like arkanoid, a spinner might be interesting.
Something that I had been considering, was to put a spinner on the front panel instead of the control panel. Not sure how this would work out.