Whilst I totally understand the sentiment, I personally feel that this would just add further complications and opportunities for disappointment / lack of expectations being met leading to more problems than solutions.

As has always been the case, the best way to avoid situations like this is to pay more, for CE at the bottom end of the scale, flying private at the top....

That said, under 12s aren't allowed in exit rows so if you have OWS, book one of those and you'll be safe!

CB