There are some commands that it would be really nice for the game admin to have. (In the order I see them as being important.)
1. The ability to go through and delete posts by people who have dropped out of a game (or been removed)
2. The ability to edit player's posts who are (or were) members of the game they admin.
3. The ability to delete posts by people still in the game.
4. The ability to delete whole threads of their game (very handy for "game reboot scenarios).
5. Place a timer on the game- if X hasn't posted for X days, remove them from the game. (And the ability to turn this off for people going on known leave).
6. The ability to either show or remove the visibility of who plays what character. (Sometimes anonymity is neat between players especially for those who don't get along.)