Interesting idea, but won't help with back support!
I've got one of those "Everything adjustable" office type chairs and love it!
What will folks come up with next? Ever seen the chair that has you leaning on your knees? It's comfortable, but your knees will eventually start talking back at you. Same thing goes with the stretch back chairs (recliner style) that tilt more than 180 degrees.
What do you use?