So if you create up a UserTrack in the real time signature and tempo you need,
import it into Biab and set the master tempo for it so 1 bar of the time signature fits 1 bar of Biab,
this will then generate up in Biab @ the pseudo tempo giving the actual tempo of the DAW with no stretching.
If the UserTrack could have the actual real time signature rather than 3/4 4/4
ThisIsWaltz=False
then Biab could show the actual tempo 12/8 84bpm rather than the pseudo tempo 4/4 56bpm