Here's a quick tut for those who are interested.
There are a LOT of settings you can play with, so have fun with it.
Might want to edit the title so it explicitly says that you're making brushes with Mangastudio 5. I saw this on the front page and only clicked out of curiosity, but it does help people who are searching for Mangastudio 5-specific advice. Thanks for the tutorial!
Oh that's awesome