I have tried this a few times and it seems it may possibly be a bug. I have added moderator authority to multiple forums for a user using the permissions form in the user management section of the control panel.
Although, when I do this, it does add them to the moderator list for all the forums I selected in the control panel, they do not show as a moderator at the top of the forum they moderate (other moderators do)?
Hope that makes some sense!
Andrew
