excellent, Alan. You have expressed my same exact thoughts. I 'd also add that a composer has to be able to write in many styles, and harmony approaches change a lot with the many styles of music, therefore it would be nice to have all these options. And instead of updating BB with a new chord and satisfy all these variables, it would be better to allow the user to just define his own, then we would have the option to both use BB as it is now, as well as going as far as you want with chord definition. Even playing more advanced things like 10-tone clusters....why not?
It's not what I do (at least not for a few years yet! ) but it would be nice to know that there is no harmony limitations on BB other than one's knowledge and intentions.