Hi Kirk,
As long as you are thinking about crop features....
On occasion I need to duplicate crops from one image to another. For example, I might render multiple copies, bracketing exposure. Then I want to print the images to see which I like best. If I print with a crop it's like pulling teeth to duplicate the crops in order to get consistent framing of the print set.
So... a "copy crop" option would be very helpful. I know there are some things to think about, in the case where the pixel dimensions are not identical but that's why you get the big bucks
Best,
Neil