2D Collider with Sphere (2.5D), Rotation of Spere (Angular speed)

Hi,

the following situation. I have cylinder they slide (round side is up in 2d game). They can hit a ball. For performance i have 2D circle collider (cylinders and ball) and therefore 2D gamephysics. The problem is when a cylinder collides with the ball, the ball don't rotate.
Some suggestion for a solution of this problem?
I don't want to make the rotation by script (onCollision event).
Collision with the 2D circle collider of the cylinder with the 3D sphere collider of a ball doesn't work (if it works, this could be a solution)