It would be nice to be able to resize the viewing window while maintaining the current aspect ratio. Dragging a single border might continue to resize the window like it does now but dragging a corner (two borders) should only "zoom" the window -- in or out -- and keep the aspect ratio (e.g. 3:4) intact all the time. See here for our discussion: viewtopic.php?f=2&t=50950
Best regards, Stefan.