Shamelessly borrowing from MightyPirates/OpenComputers#3072, it would be rather nice if we could hide the bounding box for monitors when hovering over them. This would hopefully make working with multi-block screens a little more visually appealing, as you haven't got an ugly rectangle over it.

One possible improvement we could make to the above suggestion would be to render the whole bounding box aside from edges adjacent to other monitors. Not sure how this well this'll look though, so something to play with.