I never use the RealDrums in BIAB for a number of reasons:
(1) I can't tweak and control them.
(2) I don't like some of the kit sounds.
(3) Pushes are not very good at all.
(4) I want full control so I can put in fills and lots of other things I think drummers would do in the piece.
I use
XLN's Addictive Drums which have amazing samples sounds, different kits, and MIDI patterns and fills which I can tweak easily.
When I've got the tracks I need in BIAB (mainly RealTracks nowadays) I drag them into Sonar X3. I then add a MIDI drum track with Addictive Drums and all the tracks lock together nicely. I start with a bread and butter beat and then as I listen I add the fills, end of section crashes, punctuations, etc. that a drummer would put in. Years of playing in bands helps me to know what sort of things are needed. As I work on the project I always do a lot of tweaking to the drums; they're an extremely important element of pop/rock, etc.
John