How about making it possible to use Paste Spec. on all of the screens of a map? This would save a tremendous amount of time.
Paste Spec. To All
Paste Special? Explain how this would be different form Paste All to All?
There is already a Paste Spec. feature that lets you choose what in specific you wish to paste. A "To All" version of that would be convenient.
YES PLEASE! The immediate example that comes to mind is that if you design your tileset around the "Layer 2 is background" screen flag (as I have done, recently).