-Move your head to move the camera. -Hold space to draw. -Move the mouse to the top of the stage to change the color of the pen. -Clearing the board: E + enter for everything to be cleared; R + enter for small +'s that can make it easier to see where the camera is; and Q for spheres.
I am so excited this extension got added! Yes, for the 'normal' uses, but especially for using it with 3D like this.