A version of tilt up/tilt down that is 0 when the device is facing forward instead of straight down.
A project where I want to be able to tell the angle the device is relative to being held straight out, instead of going up and going down being completely identical.
Currently, if you hold the device straight out, tilt up will be 100. If you move it up, it will go down. If you move it down, it will also go down. There is no way to tell these two apart. It would be much better if we did.