Before you try to do this, have you confirmed that there is nothing in AD that is going to contradict this? Also, i am slightly puzzled as to why you would be allowed to do this but not get AD modified (which is the best way to achieve this setting). Sounds like odd politics or a particularly unfriendly outsourcing partner.
Mark Star - MarXtar LANDesk Enhancements
Home of Power State Notifier & Wake-On-WAN for LANDesk