When I right-click to see the available operations when editing a form, here is what I get:
I frequently want to cut, copy or paste in this editing situation, but those operations are not in the menu. I suggest for consistency where information is entered that these three basic commands be added for editing all form fields.
I have discovered that CMD-X, -C and -V do work. But for consistency confidence, Cut, Copy and Paste ought to be there.