Being able to see the audio waveform in the timeline would help greatly in calling lip sync and audio cue notes.
The ability to paste into the drawing layer from the clip board would be very useful for adding reference from the story board or other sources.
To easily be able to see notes written on previous versions when viewing the new versions would speed up reviews.
I often have to go back and forth between old and revised versions to compare, a split play back window showing each version playing in sync would be very helpful and time saving.