And yes, I agree that we should add Fx-Cop to O2.
So who wants to do it? This could actually be a good case study for how to add support for other tools to O2. I do this all the time, so it would be good if you guys also figured out how to do it too :)
Btw, if you want to write a blog post on the O2 Platform blog, let me know your wordpress account and I'll add you to it