I think this is part of the GE already. If you are talking about what I think you are talking about. There are shots taken after 3-4 seconds of possession (from a steal or a rebound)
If this is the case, then it would be a great flavor improvement to have the scoring message reflect that a play was the result of a fast break. Assuming the GE generates the odd uncontested layup/dunk chance, it would be nice to see messages for those, too.