Sort of a self correcting system? I could see how that would be stable, but given the thread, don't know where or why you would want this UNLESS a floating entity is what you wanted (like a hovercar or ghost).

As to Lords position don't give up on the PE just yet. While it may seem overkill on a 2D sprite, it can in fact give the sprite the illusion of being real if the physics are tight. Not knowing the full extent of your application though, I would have to say that it **seems** like overkill, but it may not be!!!