Hi. Just a couple of corrections to my post.
The face sensor in the Pimax mask does in fact work on my unit.
The problem was as I have to have a second pair of lenses over the main Pimax lenses to get focus (I wear glasses) and the edge of the lens was causing a reflection and preventing the sensor from doing it's thing.
I have adjusted the position of the lenses and now the display turns off when I take it off.
I have not tried VorpX. I read several reviews, some good some not good, that I just wasn't prepared to spend the AU$50. If they had a trial version I would give it a try and if it worked for my games, I would be glad to buy it.
As far as turning the display off. In my opinion VorpX should definitely not turn the display of, ever.
There are too many variables in play for it to make a correct decision on when to turn it off.
I can understand the display being turned off if the HMS is still for several minutes, but not seconds.