the only problem with his theory, is the fact that trackables are placed on the map, not on the screen. you could make them where the screen is, however since trackables cannot be destroyed, it would start to lag after a while, unless you plan a stationary turret, trackable screen turning isnt so wise, although if you delve in to the mpq, theres something that changes the icon for your mouse when you reach one of the 4 sides of the screen, maybe theres a way to set a trigger off that event, if so the rest is cake