I like keeping the midi side separate from editing in Audition. I do all the "non-live" work in Sonar, with drums, pianos, organ etc (everything I can't play
), render them either to finished mono or for drums often to individual drum tracks, then open them in Audition and add guitar, bass and vocals.
It isn't often I have to go back and re-render the midi tracks, but if I do, I have the session saved in Sonar so it's only a matter of a few minutes work. And it alll works much better in Sonar than in Audition - horses for courses sez I!