[GraemeJ]

I tried a number of different ideas before settling on my final design for a BT controller and all the 'handheld' type devices I played around with (mice, camera controller, etc.) had one major drawback - after a set period, they time out!  Furthermore, I could never find a means to defeat this 'feature'.

This is a major drawback for our sort of use and I would suggest that you check that whatever device you decide on does not time out - before getting too involved.