Help with automatic DNS Registration of VPN Clients

We are using CMAK 1.3 to create a VPN connection into our Organistation. This
is working fine except the Clients do not Register their new addresses in DNS
once dialed in. I know how to resolve this:

Place a tick in the "Register this connection's addresses in DNS" on the
DNS tab of Advanced TCP/IP Settings which you access by first choosing
Properties, then Networking tab, then TCP/IP properties.

HOWEVER, I do not want to have to manually configure this on Thousands of
machines. Is there a way of doing this in the CMAK Profile or another
automated method?

This is a major issue for us. Any help at all will be most appreciated.