More work will need be done to get anything past 10.6.3 to work, but here's the offset:
10.6.4 : $005393A0
I was reading up on C4, and apprently they changed some of the networking around, so once 10.6.4 came out designed for C4, i figured it wouldn't work on priv servers anymore.
So i figured out what token.exe was changing, and found the offset for 10.6.4 (see above), changed it, and I was right, 10.6.4 with the right off set changed, you are able to log in, but once you do, you are forced out:
Then your disconnected, looks like more work will need to be done to get it to work.