OH and one other thing...

The term Autorotation is correct here. It comes from the fact that since you have one wing stalled and the other wing unstalled the place wants to roll "automatically" on its own.

The term originates from the spin maneuver. Some aircraft once in a spin, when the pilot releases the controls, will continue to spin until the pilot initiates recovery action. This is the AUTO part of auto-rotation.

A snap roll is simply a spin that's done horizontally. So I think you can still call it autorotation.

The roll CAN be faster than with just ailerons because you're using the whole wing to create the rolling moment. Not just the control surface.

Tom