As I requested during the last mobile user group meeting, I'd like to have the ability to easily toggle on and off movement of the avatar. This would help prevent accidental movement when what you want to do is to "cam around" or zoom in and out. This would be helpful regardless if keeping the "joystick" or implement other ways to move around as was mentioned by, I believe, Pluto. It could be an icon that looks like four arrow keys with a padlock, set into a corner, that could be double-tapped to toggle. Or it could be an icon that looks like two footprints.