I hope this won't be considered spam, but I've started working on a StyleCop fixer using Roslyn - StyleCopMagic. You can find it on GitHub:
https://github.com/grokys/StyleCopMagic
It's very early days, and my first project using Roslyn, so it's been quite a learning experience for me. I'd be interested to see if any Roslyn experts have better ways to do things than I've done them. Particularly where I've added TODOs.
Anyway, thought I'd post it here in case anyone finds it interesting.
Thanks!