|You can't change the <Alt>-F4 action to <Alt>-`. (Well, you possibly could be writing your own keyboard map, but you probably wouldn't be asking if you knew how to do that.) |
Your best bet would be to get a keyboard with some programmable keys and then assign the action that way. For example, my Logitech S520 allows you to do that or - even better - assign that function to the middle mouse button.