This add-on will make it possible to log all moderation related actions to the log, even if the user isn't a real moderator.
By default, Xenforo will only log moderator actions if the user is part of the moderators group (Groups & permissions > Staff > Moderators).
Sometimes you may want to give a normal user extra moderator permissions, like the ability to lock/unlock threads without making this user a real moderator. These actions are not logged. That's why you may need this add-on.