I usually bounce tracks to wav files and import into protools...
being able to bounce each drum part to a separate wave file would be fantastic !
Currently I have to bounce drums to a mid file, strip away other midi parts, import into drum instrument and mute and bounce Kick, Snare, etc. separately.
why not have drums on submixer and be able to mute/solo individual drum parts as part of your BIAB song AND mute/.solo parts for bounce to wav/aiff !