Users have been asking for a 6/8 for years.
I DO wish that biab would support this timing as us Scottish players LOVE 6/8s for various types of tunes. What I would use it for is basically to have a copy of my own tunes in sheet music form. I CAN'T write music so biab has been a major asset to me. For recording Scottish music I now use my Limex V3 expander which CAN'T be beaten for Scottish rhythm, but it is pretty crap for country & middle of the road stuff which is where biab comes into its own.