It's just matter to add somethin like && !$user->isBlocked() to if ( $user->isAllowed( 'chat' ) ) conditions on Send and SendPM API classes. Maybe there should be a config var to control this.
Topic on Extension talk:MediaWikiChat
Good shout, I guess blocked users should never be able to chat.
Done.
I thought we already implemented this before since I know I've put in a ticket about it in the past.
Thanks for the quick response and implementation!
Did we? No clue :)