Bukkit

Can I have an option/command to just turn the message off comletely, including the sender? I plan to use this to inform and question my players when I'm not around, but for a time I don't need the message, creating a new blank message, turning off the sender-use, and restarting the server is a bit of a pain. Also, the command to turn off the sender doesn't seem to be working, which means I need to go into the config files to change this value and turn off the message completely.