Yeah NextLevel that's exactly it. I think I've been explaining it badly, but you get what I mean. I think I've got a better way of describing the request, here goes...
When rolling your head, the images on the screen rotate in relation to the screen so that the horizon in the video is always parallel to the horizon in the real world. Makes sense. The downside of this is that, as Andy says, the lenses that captured the video were always at the same height, whereas if you roll your head your eyes are no longer at the same height. So, the left and right images will no longer line up.
What we're requesting is a feature to ignore the roll of the head, so that the horizon in the video doesn't have to match the horizon in the real world. The images would not rotate in relation to the screen (though you'd still be able to look left and right, and up and down). In the extreme case with this option enabled you could be lying on your side and see a horizon that was vertical, which is obviously unrealistic, but at least the left and right images would still be aligned.
I'm sure beyond a certain angle this would make looking left-right and up-down feel very odd as the image would not be responding normally to head movements, but I still think it would be a useful option.
Thanks again for your time.