I’d like to be able to unpush an elevator button. How many times have you been in an elevator and pushed the wrong button? How many times have you seen someone else do it? The only remedy is to let the doors open on the errant floor, and then push the “close doors” button.
A double-click on the button could unpush it. Could the elevator biometrically register the identity of the button pusher and then limit unpush privileges to that individual?
Hmmmm…maybe I should just take the stairs.