Thread:Extension talk:OpenID/Howo to prevent OpenID account creation/reply

Yes, it should be possible to create account without passwords, e.g. by Admin only.

You wrote "OpenID always requires to create local account with password."., but this is not correct - as such, because you can have an existing account (created via other methods), and then (later) add one or more OpenID identities to that existing account.

Is that what you wish to have ?

You need to set the correct permissions. I'll add the detailed information later here.