+1 along with all the other limitations from the 8.3 DOS days, the current time signature limitation are ingrained in so many parts of BB, maybe a re-write would be better.

As I mentioned, this would be easy to do in the BiabVST, if it did all the functions directly in the BiabVST rather that calling on the BBW4 app running in the background (that is basically Biab).
This will give real time signatures, more chords per bar, instant gen/re-gen/play any section and decimal tempo maps, the development will be at lightning speed as it won't be limited by the limitations of Biab and the time "waiting" for the developers to implement that side of the BiabVST functions in BBW4, bye bye BBW4 hello all in one BiabVST advanced features.