I think it would be great if you had the option to place a range of different types of fills via Real Drums wherever you required them in a song. This could maybe be a micro-fill, mini-fill, medium-fill, big-fill and also add options for degree of crash cymbal hit or maybe no crash hit.

This would add an extra degree of flexibility over the current implementation of fills.

Maybe it would need to have a whole new category of real tracks devoted to small, medium, large fills made up which any BIAB song could plug into whenever you specified them. You maybe could also add in fills suitable for endings too.

www.tonycliffmusic.com
http://tonycliff.bandcamp.com