What would be great is if they had just plain walls, but you build the window port/door into the wall where desired. That way they don't need to create/model every variant, just one wall, the port frame and the door frame. Then we can place the window/door to the left, right center, top or bottom to suit our design.
Edit: I just re-read the "answer" I think this might be what Hipida was getting at.