"...Look at police training. One hand has a big old maglight STRETCHED off to the side and the duty arm in the other..."

Actually, that is the pretty much antiquated FBI technique. Most officers/agencies found that it was pretty difficult to point the weapon with one hand and the flashlight with the other hand at the same point. Most officers nowadays either have the light attached to a rail under their weapon, or use the Harrris technique . Won't work well with a shotgun of course...