Maybe it’s been said in a way I didn’t quite catch, but if I wanted to do what you are describing, I’d use 15 unique sequences, each representing one of your cue sections. If they use same or similar instrumentation, all the better, do 14 ( or however many ) “save as” instances as made sense. I’d then write my cues purely in MIDI until I was pretty happy with the timing and hit points, adjusting tempo and time signature as necessary. Then and only then would I add any audio tracks, trying to play them over the tempo changes, because 5.5’s timestretch was so bad sounding. Hopefully C6 changes that, in which case audio can be recorded at any point in the process.
Good luck with your project.