I remember someone said a while back that there was no way to have a specific list of players that could get on, except for a password. There is a way, and it is quite flexible. All it needs is ip. Set it up by using addip and the ip you need, do it as many times as needed for the special players. I know this bans by DEFAULT, but you can make it so no one but those listed can connect. When you have added all you need, change the cvar g_filterban from 1 to 0. Presto, exclusive game, no password required.