not right now. SirP plans to have a window-mode, so it can be scaled as the user wants it to be scaled. Since graphics are originally for 5:4 ratio resolutions, you could then scale it to fix vertically to your screen and have small empty areas to the left and right of the screen where your desktop would probably "shine through"
. Maybe there'll also be a way to have black borders like in videos which would look much better.
Maybe planets can be destretched in particular since they are the most common thing to notice that the screen isn't exactly in its intended proportions..