I've never tried this before, so I thought I'd have a go. I installed the MCC Sandbox 2 MOD version:
http://www.armaholic.com/page.php?id=15546As I loaded up the mission, it displayed a box in the top right saying it was synchronising with the server. I thought that most odd as there's no server to sync with. But its progress bar grew bigger and it finished, saying it was synced up.
I pulled up the control from the action (mousewheel/square brackets) menu. Quite a nice slick interface. Everything I tried failed. It generated an "Access denied" message. I then spotted the "login" button and pressed it. The button greyed out and the "logout" button became available, so I guess it logged in - though to where it thinks it logged in I have no idea. But everything still prompted the "Access denied" message.
So after this short try, I'm pretty sure that it doesn't work and won't work. I'm guessing that it works by accessing the server and modifying the mission file on the fly, so that won't work in single player as there's no real server for it to log into.