Add the possibility to expand a window with the Window Action Key
Feature summary
I find the Window Action Key very useful (for those who ignore what it is, it's a key that, when pressed, allows you to manipulate windows with the mouse; it's configurable with Gnome Tweaks), however it lacks the possibility to expand a window.
How would you like it to work
Pressing the Window Action Key then double-clicking on a window would expand this window.