So I use the Screen Width and Screen Height sections in the plug-in to change the game window resolution, in this case to 768x720. It resizes the window that the game runs in, but it doesn't actually display the game resized in any way. The game stays the original resolution, with the top cut off (normal, I didn't expect it to do any scaling, and this is what I wanted), and vertical black bars along each side of the game window (not normal, not wanted).
This is all in windowed mode, not in full screen, so I don't think it's any kind of aspect ratio problem.
How do I get rid of the black bars, and get the plug-in to display the game all the way to the edges of the window?
Things it is not:
Another mod (I've tried running just the core engine to the same result)
Map is too small (Tested on a 500x500, it cuts off the sides of the game window with black bars regardless of map size)