I think it would be use when you make a larger page (map) in the editor and instead of having to drag around, or click on the scroll bars, it would be nice if the arrow keys or wasd could more you around. If you didn't select anything and are not entered into the text thing that pressing these keys would move the map around for you, like when you use the pan tool. I just find it annoying to have to scroll around or zoom way out on some of my maps. Just a thought ^_^