[walterbell]

I've enabled VoiceOver for testing but had not seen that gesture, thanks for the pointer. It is useful but slightly awkward as you need both fingers to retain contact with the screen while rotating, which is challenging for a 360 degree rotation :)

[M4v3R]

You don't have to do full rotation in one go. It's hard to explain, but you basically need to do this (assuming right hand): put your thumb and index finger on the screen, and then do a swipe left motion with your index finger, while having thumb in place. Then lift the index finger, move it back to starting position and repeat. With that gesture you can advance the rotor by one position at time.