An "Edit" menu (cut, copy, paste, undo, redo, etc.) is definitely one of the features I'd like to implement.
Unfortunely there is a lot of clean up work to be done before that can be attempted.
One thing to note is that every time you store your layout a backup copy is made of the previous store.
This means that you can undo everything back to the previous stores just by restarting and reloading the appropriate backup file.
It would be convenient if LE had a "reload from disk" option… but that's almost as hard as implementing an "Undo".
BTW: You can log issues (including feature requests) at?
George Warner