@ SecretGlitch: Oops. I didn't publish the changes to the website because the file was still uploading. Then, I totally forgot to do it. Fixed now. Thanks for notifying me.
@ SergioCornaga: It's a technical issue. When KS+ is running in test mode it doesn't require the fancy tricks that allow it to do scaling and fullscreen, so it skips them. Hiding the desktop relies on the fanciness that get left out. I could change it, but this late in the game I'm afraid of breaking something else, and not discovering it while I can still fix it.
@ dow: The zoom function disables itself if your screen resolution is too low to handle it. You must have 1200 horizontal pixels to see 200% zoom, 1800 pixels to see 300%. It looks absolutely wretched if it tries to scale beyond your screen's capacity. It would stop at the screen's side but continue scaling vertically distorting the play area. Scaling to non-multiples like 150% also has terrible results, some pixels are doubled while others aren't.