Right now there is know way to restart the MOHAA within MOH.
Most hosting companies might have other ways to do this.
My old host,
http://www.xgamernet.com/ had a script running, when it noticed mohaa.exe not running ( because you could "rcon quite" ) it would restart it automatically
My new host
http://www.xgamingservers.com/ has a control panel that allows you to reboot the exe. you can even stop it ( to perform maintenance on the server )