Archie
How about a minimum number of players to start the game? It's good for servers with a small community EDIT: added more stuff
If a command has been set at 0, 0, 0, then every time a player touches/breaks a block that command is executed. It can be a huge problem.
One of my staff put a command to pay a shopkeeper for every time someone tapped the anvil. Everytime a client would break a block, they'd unintentionally pay 25 for...
The console output made me just as surprised... I am using PMMP build 659. I'm on Windows 7. (ancient, right?)