The post you quoted was refering to animations, not the model I think. However I like both the animation and model permatation ideas, if they can be done they should be done, so the fp and 3p match up.
At present the fp arms model is defined in the globals tag, that would need to be moved to each biped tag (which makes me think it wouldn't be possible) if you expect to be able to bump posess other bipeds and see a change in fp arms.
I've just updated my post from a page or two back, please don't overlook it when you come to tell us what isn't possible and what is.
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