In layout mode, we have the non-visible layout area at the right, and it is very useful. That's what I'm referring to as the "pasteboard."
I'd love to see the pasteboard extended below the layout. This would be extremely useful when editing a list view layout, so we wouldn't have to keep scrolling horizontally as we move our fields; and there's plenty of room when your body part is short.
Ideally the pasteboard would extend to all four sides of the layout. But I'd be very happy just to see it added to the bottom.