Little request for C2 and probably C3...
When you set "Window Size" in Properties panel could that size be a default size for all new created layouts?
For now, every time you create new layout it makes it "1708x960" which is a very specific size and I'm sure first thing everyone does is changing it to the size their want.
Or even something like a global option in preferences of the editor where you could set your own default values for layout size, margins etc.