It needs to be quick and easy to do, Drag n Drop would do it:
As you drag n drop a RealTrack from the picker into the Biab timeline it will go in as 1 bar
This can be copied, moved or resized
You can play/preview it in the chord position
You can Regenerate
You can set the color of the item for a quick visual to see where it repeats on the timeline
You can adjust the volume for one section of a RealTrack or adjust the same for all occurrences of that RealTrack.

These are movable segments representing the RealTracks, Biab will generate the track accordingly:
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