Harley: One could edit the registry, but that's not something that should be done by the casual user. TweakUI might help, but I don't know if it comes in a flavour compatible with your friends computer, since you didn't mention the OS. Outhouse is a PITA to make behave, especially when you have the audacity to not use Bill Gate's favourite.
(hide) If you want to play a game with an opponent of a similar level, you can define a required BKR range for a new game invitation. Then nobody with a BKR outside this range will be able to see/accept it. (Katechka) (show all tips)