Lush,
if your using Fire Deamon, it has a web interface, you can give other clan members access to it. The web interface will let you start and stop defined services.
If your game service is set to restart, you could also use the Web Admin and go to the Management Console and type Exit or Quit, this will stop the game service and it will autostart, kicking any players that were connected. That way, any clan members with access to the Web Admin will be able to restart the game. Dont know if I would fully trust this method though.