Currently on LiveJournal, OpenID comments count as comments from registered users for the purposes of allowing or screening comments. To allow OpenID comments, a user must also set his or her account to allow comments from registered users. There is no way to allow a specific OpenID account to comment without enabling commenting from registered users. However, specific OpenID accounts can be banned from commenting when commenting from registered users is enabled.
23 - the second bullet point in each list is now incorrect.