Latest Version of AudioBus 3 allows you to record Midi Data in BM3
Just tested recording midi data from Rozeta Suite into BeatMaker 3 if you're game...seems to be working. Just host your midiFX in AB3 and point it to the appropriate Virtual (Audiobus) Midi Channel 
Personally tested it with Collider, Particles and Arp units and was able to hear, record and play midi back in BM3.
Looking forward to when we can do this internally like we can in Cubasis, but good to know the workaround works.
-policarpo