Add keyboard shortcut to exit a movie during full screen

Hi, there
I noticed that the “esc” key is used to exit fullscreen in fullscreen mode when playing a moving (ref Exit Fullscreen Mode by pressing "ESC").
However, I really want to have a keyboard shortcut to just exit the movie in fullscreen mode. Perhaps “backspace” is a good idea. Or, let the user to config the behavior of “esc” key in fullscreen.

Double tap esc?

I just want to exit the movie, but remain the fullscreen mode.