Is there a way in CA to record a limb movement as a key-triggered behavior, ie a character throws their arms up on a key command? Seems like I could make multiple body layers in the necessary positions from PhotoShop and use Cycle Layers in CA, but I'm not sure how that would affect body warp from head movement, which I would like to retain. Can this be done with Dragger?
Not yet, but a common request. For now limb movement like that is usually done with either dragger or cycle layers animations (and usually people pick one or the other).