Very unlikely...I would suggest learning how to use the Before/After function and if need be, Snapshots. Once removed (such as the old manual Defringe sliders) I've never seen a function returned.
By the way, you do realize this is a User to User forum, right? On occasion, some of the ACR engineers may post, but they do so on their own time and not as part of their job responsibility. So, when you post here, it's not to Adobe, just other users like yourself.