P: Offer hinting to assists when Automatic Subject Masking selects wrong subject

I recommend a "hint" feature for the subject masking that allows the user to suggest to lightroom which subject the user wants to mask. When the system gets the masking demonstrably wrong it could help to move the edit pin to an area where the actual subject is as a starting point for the mask. 

This is valuable to use the subject mask even when the system gets it wrong on the first try.