Sorry I'm at a loss here where you are going. Bear with me I'll get there.
"I would like to see a gif where you attempt the same thing you've done in Reaper but this time do it in BIAB on a single Utility Track. Demonstrate highlighting a bar and regenerate just those highlighted bars in BIAB and also regenerate the region 5 times like you've done in Reaper"
Isn't that what the pic represents ?
Unless you want a take system like Reaper and toggle through the multiriffs in a section of track ?

"Multi Riffs were rejected by forum members" ?????

My posts are about playing files direct from disk that Reaper does.

The main problem with Util tracks are they are wav and users wanted them to behave as regular BB tracks. I'm trying to get Reaper features in Biab so this can all happen thus the Reaper gifs,
as I don't know if you can have all these tracks in RAM along with all the multiriff takes and more than 255 bars ? where as if it's just data that tells BB what section of this here file to play:
D:\bb\RealTracks\Bass, Acoustic, Bossa Ev 110\bs1266.wav
rather than piecing it together first and storing it to RAM or then writing it to wav.
At the moment Util Track Gen is a make do until..

The whole idea of Utility tracks came from all my posts with EnergyXT:



Biab Track Injector for Reaper
Free Biab Chord Picker Tool