Mercy - Guardian Angel Keybind Suggestion

I’ve been playing mercy for a while and there is still no function to use GA on current healing target and the target infront of you with separated keybinding, there is only the option to “Toggle prefered beam target” but that’s it. i would like to use for example:

Shift for current healing target beam
M4 for targeted player

I think this can improve her skill by giving her more options to move and ways to trick the enemy.