There is one resolution script (not at the top of my head at the moment--the one where the demo has the title screen of like 3 guys staring at you) that allows fullscreen for various sizes, but it "fakes" it, by which it draws a black rectangle around the game window. There are ways where you can check the user's capable screen resolutions and, if it matches with your game's, you can forcefully change the monitor's resolution. I tried researching on this more than a year ago when I didn't have a basic understanding of Win32API--it was something I wanted to add to Custom Resolution.