[GaardenZwerch]

My Samsung P900 has settings that are used to detect whether or not you are looking at it - used to pause a video, or something along those lines.  

Quite honestly, I've never even tried using them, but there might be something in there that would allow you to do what you require.

Yes, I remember that, but it is not very practical, and I doubt that it works with anything else than samsung's own apps. IRC turning your head away would stop 
the movie player and tilting your head down would scroll in the browser... But I'm not sure if this genrates a pagedown event that any app could receive.
Graeme, if you still have the stock rom on your Note, could you try if it works, please? 

Thanks a lot in advance,