I use a single midi track for the main drum midi data, and one additional midi track that I use for a click track.
All of my drum kits used in songs are in custom kits in Battery 3, with each cell containing the exact samples for the particular kit piece. Each cell is then routed through Battery 3's internal mixer to go to its own separate stereo audio outputs.
Then, in Sonar, I set up separate audio tracks for each kit piece, and different clumps of drums are sent to their own bus, then those buses feed the main drums bus, which then feeds the master bus.
Every time I build a custom kit in Battery 3, I get all the cells set up, along with the audio tracks and buses, then save it off as a track template, so that I can quickly insert a ready to go drum kit in the future.
While some folks once in a while post about splitting each drum note off to its own midi track, it seems most folks use 1 midi track for all of the drums data.
I believe it MUCH easier to work with it all in a single midi track for editing, and in general, and splitting all of the kit pieces to their own audio tracks gives me all of the control over drum volumes and effects that I could ever want.
Think of what you would need to do to change a beat, or fix a roll, if each drum was on its own midi track. What a nightmare.
I hope any of the above give you some things to think throiugh.
Bob Bone