Yeah we have some work to do to make it easier to navigate on the keyboard.
For the "parent window" what are you imagining here as your frame of reference? This idea makes sense but I'm wondering if you want to designate a specific window as an anchor vs some heuristic that identifies such an anchor.
We should be placing the editors in your viewport so that you don't have to do manual arrangement. We try to fit as many editors in your viewport as possible.
I use a 15 inch laptop and it works well there. I do not know how small your screen is, but please let me know if you feel like it's not ergonomic for smaller screens.
For the "parent window" what are you imagining here as your frame of reference? This idea makes sense but I'm wondering if you want to designate a specific window as an anchor vs some heuristic that identifies such an anchor.