@fti great suggestion here!
@jmlowden if you haven’t already, you should go vote on this Product Suggestion specifically for undo! Undo multiple actions
I remember when Zelda the kitten tried to do her first Tulip app building 
(LTS 8.2 Undo - Only One Step?)
If anyone else in the community would like more keyboard shortcuts in app editor (or elsewhere in the platform) - let us know here and vote!