Yeah I guess it was my imagination and I confused it with the auto-mode.
If you think you could implement these features I think that would definitely create a more interactive experience.
I'm not sure how programming for sensor controls works, or how difficult it is though... so I don't want to make any requests that add extreme stress to your process.
I do know that sensor controls for the up-down thrusting are possible though, based on a couple other games. The NejiSim series some by NeetCorp others by YabukaRadoo.
As far as shaking her head I'd think tilting either direction, choking to the right but further and after a slight pause in motion. Release to the left.