Thank you, it works!
It is kind of sensitive though as is the nodding and head shaking. It maybe my mouse but it often takes several (distracting) attempts to get the speed and accuracy of the mouse movements right. Maybe as an alternative we could simply have a clickable option "Yes" "No" "Assume the position" etc? Or just keyboard options Y/N O=Obey?
Of course different folk will like different input methods but surely providing alternatives would do no harm (as long as they don't conflict with each other)?
About to play the full game so I'll see how I get on :-)