disabling printer sharing via MCX record

Hello all, Anyone know how to permanently disable printer sharing via MCX records? I traced which plists are affected byturning on printer sharing in the sharing control panel, it seems to be /Library/Preferences/SystemConfiguration/com.apple.smb.server.plist however when I check out the changes made to that plist I discover that it is not so simple as an on-off switch. When you turn it on it adds a service to the list, turn it off it takes the service away. That means I could permanently add the service but I don't know of a way to permanently un-add the service. (it also affects the /system/library/launchdaemons/org.cups.cups-lpd.plist file in the same manner). ANy help is greatly appreciated. Knowmad