This is something which puzzles me because it's my favourite form of inflation, but I've rarely if ever seen it done or depicted. Nobody ever seems to draw an inflatee with splayed, uninflated limbs. Full body inflation always seems to involve either everything blowing up including the limbs except the head or a spherical body which has swallowed up the arms and legs. What you never see is an inflated torso with the arms and legs sticking out perpendicular to the surface. I like this because it emphasises the helplessness and fullness, but for some reason it doesn't seem to appeal to anyone else.
So, two questions:
* Does anyone else like that, and if not why not?
* Is there a kind of inflation you'd like to see more (or some) of?
I like it, and have experimented a little bit with it. You are right in it being a relatively uncommon form of inflation. Perhaps it is simply not regarded as the "classic" full body style, or maybe it detracts from the helplessness in the sense that the limbs are still available and visible.