Let me preface by saying I know there is a Scheduled Callbacks Useronly Move Minutes feature, but I can't help but feel like I remember a different feature that would move callbacks from USERONLY to ANYONE after X time and I just can't remember what it is. However I did look through the manager manual and wasn't able to find anything so I'm just triple-checking here before I give in to the fact I'm just remembering incorrectly.
Is there any other way a callback would be changed from USERONLY to ANYONE without someone modifying the lead in the admin lead data screen?