Wouldn't it be nice if we could drag and drop an audio track or tracks into the track view? If there are other tracks already we could align the audio with them. BiaB could either determine that audio track's tempo or match said track to BiaB tempo. If BiaB time signature were still only integers the audio track would have to be stretched or shortened accordingly. This could take the place of the ACW and all of its problems. YMMV
I am seriously intrigued by this suggestion. I tend to work in the other direction: I make a rhythm backing track then take the WAV file created by BIAB into another program, my notation program. Thus I don't use or need many of the features others use, such as VST3 support or the ACW.
One reason I must go that way is the fact that BIAB is limited to tempos of integers only.
If BIAB supported non-integer tempos, I could match up BIAB files with other software better. Or, as I think Mario is suggesting, if BIAB could IMPORT an audio file and normalize the tempo to two decimal places, I think it could change my workflow to keep me working in BIAB longer.