[BJC]

This is not a good idea. When different parts of your shooter wheel have different diameters, those different parts also have different surface speeds. This means that if the ball contacts the drum in a slightly different place on the wheel it will attempt to propel the ball faster or slower. In the past with foam balls, this was really really bad. With a harder game object it might not be as detrimental to accuracy, but it will almost certainly not have any positive effect.

Cheers, Bryan