We've heard that it would be nice to be able to take the design of a Page and use it (cp/paste or import/export) to another Page of the same entity type.
Example: if you have some Pages in different Projects that you want to update to the layout of another Page, you would export its layout, then import the layout to the other Page(s).
Click 'Me Too!' to vote up this feature, and add any additional thoughts or use cases in the comments.