For 2, does Microsoft not have accessibility APIs to control window size and layout? On Apple platforms at least if you were doing this "right" you would probably create a new software virtual display and move all windows bridged into VR to that, and move and resize them as appropriate. I believe the actual implementation turns off the Mac screen (through a "curtain" I think, so idk if it's actually moving the windows around below that or what) but like there are many things you can try doing here to make it better.