Changing the position of a Bone at runtime

I just started playing around with the bone tool, but most of the tutorials I’ve seen are fairly basic and don’t talk about Actionscript at all. What I would like to do is be able to change the position - not rotation - of a bone (or joint, or what have you) at runtime. Basically I have a character whose height can be edited dynamically at runtime, and I’m trying to figure out a way to adjust the skeleton to fit the character at any height. The skeleton isn’t animated, which I assume would cause further headaches. I’m just using it for static poses. Does anyone know if this is possible?

While I’m at it, is there any way to change the position of a bone after it’s been placed? I may be missing something obvious, but I keep not quite getting it right, and I don’t see how to tweak it after the fact.