I would be interested in hearing what people do as well...
I have read that the official C2 steam plugin needs updating and that there is one in the store that works well for adding achievements, steam overlay, etc.
I have also heard there have been issues with reviewers capturing game play, and that non Windows platforms may have issues
but I don't know if those are old issues, or what versions work better than others, or what work-arounds people have tried.