EZGUI Rotating Knob?

I'm sure it can. How will depend on what you are using to display the wheel. If you are using an EZGUI control of some sort, you can use AddInputDelegate() or SetInputDeletate() to capture input to your control. The Pointer_Info will give you all the information you need to get the mouse/finger position in order to do the rotation. Depending on your needs, the structure provides you orgPos, devicePos, and inputDelta. If you are using a packed sprite, you'll have to handle the rotation in a more traditional Unity by adding a collider and using whatever input mechanics you need for your game.