Squirt happens because the CB rotates while in contact with the tip, pushing the shaft to one side and the CB the other way. So I'm thinking without CB rotation there's no squirt - but I can't think of a way to test it.
pj
chgo
I am not sure if the issue is rotation but more so the fact that if you hit the side of a round object you can't help but apply side force to it as you go through it vs just spin. The cueball does curve with spin, but that is a smaller affect than what happens when you push it to the side.
When you hit a flat surface, you also apply some side force from center, but if that center is fixed in place, would the force on one side of the surface cause it to move to the opposite side? Or just go straight anyway?
Let's say the round object could not spin, nor the flat object. But they can be moved side to side without issue. Would a square cueball have some deflection?