Frankly, I would love to see a 24-bit/96k version of BIAB. 24-bit to make it sound less "flat." 96k to make the stretching have fewer artifacts.
I already use the audiophile version, and even stretching the wav files has plenty of chirping going on.

But I know that would take a massive revamp on the back-end, and I'm guessing that nothing was originally recorded above what it's currently at, but that's my wish list.

Oh, and the ability to do chord settings in the VST. I don't understand why I can make bar changes in the VST plugin, but I can't do rests, holds, or pushes in the VST.