Allows the super admin to force all users to read his/her private chat(s). Whenever an user receives a private chat(s) from the super admin, they will now be allowed to browse the forum until they have read it/them.
You can exclude a group(s) from this restriction by going to the Group Permission, clicking the name of the group that you want to exclude and then setting the Exclude from reading admin pm option to Allow. This option can be found under the Conversation Permissions tab.
By default the mod is disabled. To enter the user id of the super admin whose personal conversation coming from will force users to read before they browse the forum, go to Options > Threads, Discussions and Conversations > Super Admin ID