Mouse Focus with Godot (Compiz w/click to focus off)

Kind of an obscure question. But I use Godot Engine a lot.

And inside Godot, there are 6 or so ‘panel’ areas that take focus. However I turn Click to Focus off in MATE+Compiz. Because that strategy is only per-window, I can’t get the app panel focus to follow the mouse within Godot.

So, is there a desktop-level solution for this situation? Or would the app (Godot) need to be modified to support it?