Hey Fizz, this might be a weird request. Are you willing to select BAs for old questions with high traffic, where the OP did select a BA on a different question? Based on what I've seen, selecting BAs wasn't encouraged as much back in the site's older days as it is now, so the OP might've just forgotten about the BA. Also, most OPs of such questions have been inactive for years. So would it be fair to select the BA in these cases?
In particular, this high traffic question has a perfect answer but the OP selected 5 BAs before:
https://pokemondb.net/pokebase/74038
Selecting the BA to such questions would simply make site quality better imo.
I feel like this could be a thing where the staff decides after looking at the case if the BA is fair, instead of a specific rule. The question would have to be an old high traffic question with inactive OP tho.