@ Sergio Cornaga: You are very right that the uninitiated need some guidance. However, features that rely on designers to use them often fail. I'm afraid it would go unused like category/size/difficulty labels often do. It's the very designers who would neglect to use the feature that would ambiguously upload levels to the archive.
I'm going to include your idea. Additionally, for my editor I'll change the default level to include info.png and info2.png. Then, I'll change info.png to an image that explains the level is likely to be KS+ or KS Ex and what to do about it. Designers could then alter both images as they see fit.
The editor still needs a lot of work. If I don't hurry up and finish it before the summer, I may not be able to. I lose access to MMF at that point.