I just want to mention that I easily converted MRBS to use our corporate single sign-on. I used host session file:
$remotehostname = $user2;
Where $user2 is created off of $_SESSION['id'] handed off by our SSO (if they don't have and id it bounces them back to sign on via SSO).
Then it uses the MRBS DB for authentication. We simply add the employee id for the name field and give them user/admin rights and works great. Nobody sees any sort of MRBS login screen and they are just in. Have used MRBS for years and want to say it was great that this whole thing took me an hour. I know that most corporate environments have SSO so maybe there could be a mention on how to do this in the help file.