Using N9 Button Monitor app, you can program the N9 to use the volume buttons as the camera button. The problem is that the volume buttons will always have their original function in addition to the programmed camera button function, which means that they will zoom in or out, altering the shot.

If cameraplus could bypass the normal zoom function of the volume rocker buttons, so that they could be used soley as focus-shoot camera controls, then that would be double awesome. The on-screen controls of the zoom function are plenty effective--I'd love to use the buttons just for focus and shoot.

FYI, as it is now, one approach is to program the long down press of the volume up key as the camera focus activator and the release of the button actually takes the photo. Single button press to shoot is another way.