Elevator Deselect

Mistakes in pressing or buttons waste time and are aggravating to endure.  Elevator buttons should work on a 'toggle' basis, where pressing the button twice deselects the floor. 

This design has been implemented in various countries, but I see no reason why it shouldn't be made a standard protocol in all elevators.

What other electronics benefit from a deselect option?

Source: Whynot Idea Exchange