Non-fixed window size or a option to make them resizeable.

Having a GUI that slides with the mouse is not a good idea, on lower resolutions you will simply don't see everything and that completely destroys the workflow. Add a option to make the windows resizeable or re-design the GUI for lower resolutions (there are several reasons for restrictions in resolutions) and make it possible to switch between GUI-modes (high-res, low-res).