1. Master password will not work before the next patch. It should really be removed from the game creating screen, but I'm too lazy.
2. Anonymous players can and should be kicked before game start. The one to do this is the game creator, and the time is when he removes the "Disallow clients to start the game" checkbox. It cannot be everybody because kicking means restarting the program on my server, and I don't want this to run rampant.
3. While I'm usually opposed to restarting games for any reason, I'm ennough of a romantic to agree the reasons below
However, if it's just a matter of choosing between two nations, the other could just be set as a computer player.
4. You cannot kick anyone by any means except by knowing their real password. The kicking feature on the server only works as long as the game has not started. If you want to know why, ask Illwinter, though I can guess, and so can you
Lots of sunshine to everyone and so forth...