You can also try the "Fit To Time" function. This also only works when there is data in a track.
PROCESS> Fit To TIme
Make sure you check the "Use Tempo" Box and you will have to re-input your original desired tempo at the start of the song . There might be an issue with audio clips getting out of sync so you might have to lock em all up in place. I use this all the time when scoring to picture, but most of the time I'm just dealing with midi data.
It works best with small amounts of time cuts, but should keep all your automation in place.