Basic Keyboard Commands
(Ctrl + X) = cut
(Ctrl + C) = copy
(Ctrl + V) = paste
(Ctrl + S) = save skin state
(Ctrl + Z) = restore previously saved skin state (just incase you make mistakes)
(spacebar) = show grid
Basic Mouse Commands
(Shift+left mouse button) = multiple button selection
You can multi select your buttons, copy, change screens, then paste. I'm also currently trying to come up with an easier way to do this, so that 1 button can be on more then one screen, that way changes to it will be seen on all the other screens....but for now you have to do it the hard way.