Remotely change local policy without group policy?

Hello all, I have a question about setting up Remote Desktop on PCs in our company. For most of the PCs on our network Remote Desktop is disabled by decree of the management. When I do need access to a machine I'll use psexec to enable the service then I'll disable it when I'm done. Some of the PCs are accessed by normal (non-admin) users on the network using Remote Desktop - we're looking for a way to remotely edit the list of users that can access the PCs that way - it'll be one specific user allowed per specific machine so a group policy doesn't seem to be the right way to go since it'd be a different policy for each machine... Basically I'm looking for a way to remotely edit a machine's local secpol, specifically the "Allow logon through terminal services" setting.
I found this MS article http://technet.microsoft.com/en-us/l.../bb457125.aspx that mentions the SeNetworkLogonRight but I don't see that in the registry... I must be missing something stupid here - there has to be an easy way to do what I'm trying to do... Does anyone know what that easy way is?
This is the command I use to enable remote desktop - it seems like something similar could be used to edit the userlist? Argh!
psexec \\machine reg add "hklm\system\currentcontrolset\control\terminal server" /f /v fDenyTSConnections /t REG_DWORD /d 0

-Oh, it's an Active Directory Domain, all the PCs are WinXP - Thanks!