this patch add panning like in the knife operator which allow to move,rotate and zoom while using the circle select operator in various editor(view3d, uv, node, etc..).
summary of the patch:
- Middle mouse move the view instead of deselect which is already handle with click+shift.
- Change Add/Subtract size of brush with Ctrl + wheelmouse instead of just wheelmouse. I originaly did the patch only for move/rotate the view tell me if this change is okay.
- wheelmouse up/down zoom the view