The elevators in my building do support this. People get confused all the time by accidentally deselecting the floor because they didn't notice it was already l

The elevators in my building do support this. People get confused all the time by accidentally deselecting the floor because they didn't notice it was already lit up. Also, the "G" light is broken in one of the elevators, which causes even more confusion (until you realise that it's not broken on the second, lower set of buttons for people in wheelchairs).