Are you doing this in biab? I am and I see what you mean.
If you are trying to keep everything in biab, then I don't know how to help you.

But if you are writing a piece for recording with/in a DAW, You can just open your biab file in realband. Then use generate realtrack (or generate realdrums in your case) on a higher numbered non-biab track.
Then you will have your drums