I treat the real-time as room-mics. I load them as the primary drum track in my DAW and then save my BIAB file as MIDI using the drums on separate tracks option. Then I load the MIDI file into the DAW and use a sampler to add individual kick and snare support blended-in underneath. Adds a little more individually controllable "umph" (the technical term) to drum parts.

Make sure the tempo and time signature match in your DAW and BIAB first though, or it won't work.

Another method I use is to add individual samples manually on top of the realdrums but that's much more time consuming because you have to sync each one up.

Cheers, T.