One of my clients using CPanel had a customer hogging all the CPU on the server due to his Microsoft Frontpage usage with the shtml.exe process. I wrote this script using cpulimit to limit its cpu usage and ran it via cron every 5 minutes:

#!/bin/sh
PROC='cpulimit'

if ! ps ax | grep -v grep | grep $PROC > /dev/null
then
/usr/local/sbin/cpulimit --exe /usr/local/frontpage/version5.0/exes/_vti_bin/shtml.exe --limit 3 &>/dev/null
fi