I know this post is 4 years old... but this seems like the perfect time to ask if you can add my difficulty to your song! I noticed there wasn't any difficulty higher than 3 stars, so i made one, plz add, even though this post is from 4 years ago.
The Download for my "Difficulty" is actually just a download for the whole song, including the previous difficulties, and mine is just added on. https://www.mediafire.com/?v49siussgbsspr1