So, having worked out there's no "instant on" magic AV mode for the Q1U (kinda annoying if it was a lower battery using iPod replacement for long plane rides) I decided it would be more useful mapping the button for me to use with the Origami Now application.
Quick hunt through the registry (all the caveats apply if you're going to do this) and you can edit this key
HKLM\System\CurrentControlSet\Control\MobilePC\HotStartButtons\1
to point to any executable you need...
Not sure what the \2, \3, \4 and \5 options were for... I suspect with AVStation they let you start in different modes, but I don't know any command line parameters for OC to check it out with ;)
Now just got to work out a risk free, cost free way to get rid of that recovery partition so I can re-use the disk space ;)