Image, if your last post that mentioned "shared LS" was a reply about my idea, then I still don't think you are understanding the idea. There would be no sharing of the Login Server. There would be a public (optional) Login Server connection and also a private (unshared and also optional) mini-login-like connection.
Here is a simple example of how it could work:
[Client]--->[Public Login Server]--->[Authenticate to Public LS Database]--->[Server]
Or
[Client]--->[Private Login Server]--->[Authenticate to Server's Account Table]--->[Server]
No sharing involved :P
|