I asked for a linear chord track in RealBand years ago.
The trouble with Biab it was made for auto accompaniment and has been added and added onto the old 90's code,
that has limitation due to the DOS era.
The problem is so many users are stuck in Biab and it's slow to develop.
I'm trying to get PG to put all the generate code into the BB Plugin so it's not dependent on BBW4 (Biab) running in the background.
This will allow the BB Plugin to develop at lightning speed as it won't be hindered by the old 90's code issues.
So for all those that use Biab for tracks in their DAW, you should be pushing more this way, as it will be the future unless Biab gets a total rewrite.
But if you need Biab here's another way A VST to send Tempo/Play/Stop/Loop/Continue to main Biab app from DAW

I got frustrated with it all so I went to Reaper and I can make it do what Biab can't just with scripting, no waiting 10 years for something to be added or fixed. I made scripts to integrate Biab and BB Plugin into Reaper.

There's an example below all done with scripting, so you can have multiple Region(Chord) tracks same with markers.
There's a chord sheet to display the region chords, it can switch from track to track (group to group), you could switch from section to section with all sections starting at bar 1 and just solo the parent track in the section group.

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Reaper-Track-Markers-Chord-Sheet.gif (308 KB, 152 downloads)