We definitely considered it, but then you'd have to make sure the screen is mounted/moving with the plane, not on a yoke or knee. Additionally you'd need to make sure it is aligned with the compass, etc. There is just to much to go wrong in order to use the tablets sensors for an accurate AHRS for flight.
It's on our wishlist to I'm sure we'll continue to look at it, but for know its just not safe or consistent to use the tablet sensors. I hope this helps.