I see you are in the 919 area code. There's a few of us in the Raleigh area here.

I don't think BB will do Bach choral very well. It's designed more for modern music

Regarding 2 & 3 .... Again, there's a few new age styles that might work. But, in my experience, it's not going to give you anything that's really suitable for games and ambient underscore. For that, using your VSTs are going to get a much better quality than you will get from BB alone.

Any of the styles it does have sound a bit generic which is the kiss of death if you are trying to get commercial placement. I've used BB for several commercial placement uses but I did a lot of work on the tracks and they are not straightforward BB tracks alone.

I'm not saying that someone couldn't create a style that works but I think it might be easier in the long run to create the music in other ways

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.