>>Someone who uses BIAB to compose will use a different set of tools than one who uses BIAB to gig live, which will be >>different from someone who is mainly into bringing in MIDI files to jam along to, which will be different from someone who >>
>>uses BIAB as a somewhat limited, but useful recording studio

I agree with that. The multifunctional aspect of BiAB is both its strength and its weakness, especially when its functions are not channeled into workflows. Until now the GUI just looks like a "table of content" of book. Redesign GUI does not simply mean rearraging the buttons but much more: you have to define clear workflows and incorporate them into the interface.
One step forward could be the fact that the user could choose at the beginning from different project types. Depending on the project type chosen the GUI is then customzed to fit. What I am saying is that functions could be grouped more together to serve the given context.