it'd be cool if you could set your height/size
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Said it many times before, but will say it again; the paperdoll animations would either need to be completely changed to facilitate it or have many, many new animations added, otherwise animations would not line up in the slightest. It would be a difficult undertaking that would most likely make the game run worse.
It would still need additional animations to work together. Every animation would need an animation that corresponds to the partners animation, and even with three sizes that would be a lot. I'm not saying its impossible, but it would far more than quadruple the animation count in the game. It may be better suited to being a mod.