seriously, if you're going to try to create custom map types at least have the decency of recognizing that other people have already made their own and that by replacing their file, you effectively erased all of the work they've done by themselves. If you can not nor are you willing to make a tool to create map types, do not waste our time and our temperament on something so trivial. The proper thing to do would be to create a tutorial.
indeed. this is kinda stupid.
you could write a tutorial how to add it but it's nonsense to download a new file just for this single addition (which is like adding one line to the file).