[Authentication] Disable automatic account creation when using OpenID

[nielsbasjes]

I have installed the developer build (files are dated Jun 3rd 06:11H) and I have configured the OpenID in conjunction with Google (i.e. I'm now able to login using my Google account).

Improvement suggestion:

I want to disable automatic account creation at the moment of logging in with OpenID. The moment I first log in using OpenID a new account is created if no account exists for the provided email address. I want to disable this behavior (i.e. there should be a "no such user" error instead) and I want this to imply that I have to create users manually beforehand.