a chat with tech support confirmed that BiaB will not support fractional tempos.

No matter what the ACW indicates, once the file is transferred to BiaB, the only tempo available are whole number tempos.

So the guy in question is supposed to be working on getting me a whole number, steady tempo version. (Like it should have been to start with really)

Thanks for trying to help me solve this.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.