Shooting a curveball?

[bEdhEd]

Relevant video on the Magnus Effect

This shows the magnus effect on a soccer ball, and guess what?! He's kicking from the corner of the field into the goal too! Exactly as you requested.

I'd probably design a shooter like Ri3D 1.0 but turn it 90 degrees as you say and have one side go faster than the other to give the ball a Z axis spin to get it to curve, as our soccer player in the video does with his kick.

The hard part will be to make it curve consistently every time. It could be possible with the rotated Ri3D 1.0 shooter to have a straight shot with both rollers at the same speed and have a curved shot with one side going faster to get the Z rotation. Then you'd have a shooter that does both straight and curved shots.