We could provide an option in the future, to render the material in 24-bit when rendered.
That might help, especially if your DAW is using 24-bit. To be clear, this wouldn't be 24-bit source material in your Realtracks folders, it would be 24-bit when rendered out of BIAB. The music is already mixed internally in BIAB, RealBand (and other DAWS) using floating point, so bit depth is not an issue.