Having the cube stretched between two monitors is annoying. I think it would look really nice if you could isolate the entire cube to one monitor when the hotkey is pressed. I realize this may be similar to bug 302149 but instead of giving each monitor its own cube, I want the entire cube to only appear on one monitor. It will look better without being stretched as much, especially when the monitors are two different resolutions.
Been there, tried it, looked horrible.