I use a Logitech Cordless Optical Trackman mouse ( trackball style about $40 on Ebay ) and set it next to the number pad on the keyboard. In FSX controls I set Mouse-View Direction (0n) to the + on the number pad. This way I can always keep my hand on the mouse and toggle between changing the view, zooming in or out and operating switches ect by just reaching over with my thumb and hitting the + key ( a very large key and hard to miss). I never need to move my hand or the mouse. Not perfect by any means but after after a short time it becomes second nature. I don't have EZCA but I would think you could set it up the same way.