There needs to be a way to only scan again for channels ("re-scan") and nothing else.
The only current way is to do setup with all sorts of extraneous things.
Today, I tried doing that to re-scan and the channel I was hoping for, was not found, so I clicked "Cancel" at the end .... but .... MC21 continued to do the whole mc2xml setup anyway.
Thanks for your attention to this issue !