Name: allowspecialusesubfolder
Type: SWITCH
Default-Value: 0
Last-Modified: 3.12.0

If enabled, allows special-use folders to be moved into subfolders

By default, cyrus does not allow a special-use folder to be moved or
renamed if the new folder is not a direct folder of the users INBOX.  This
was implemented to prevent clients renaming Sent to Trash/Sent, which would
confused other clients.
