I disagree that there should be any sort of official state for captive-bred vs. wild-caught individuals. This is nearly impossible to determine for many/most observations and definitive evidence for this would be nearly impossible to provide in a photo or sound. Captive/wild is already fairly difficult to do with a fair amount of grey area, though it can be evaluated in many cases via photos. Captive-bred vs. wild would rely on even more inference and hearsay. It would also increase the already existing confusion with captive wild (eg, you could have captive-bred, wild individuals and wild-sourced captive individuals). I think trying to make this distinction would actually decrease data quality due to not being able to definitively determine captive/wild breeding for many observations and increasing confusion with existing fields.
This seems like something that would be addressed best with observation fields.