I think the implication is, since you can move all those bones -now-, and set poses -now-, it seems all that’s missing is to export that (or store internally) as part of a new animation… all the framework is there, we just need to be able to push those incremental changes to a new file as a new animation (or the newly positioned bones be tracked in a current animation copy with bone location offsets).
It’s not overly trivial to do, I’m sure… but it sure isn’t anything more added to our current tool in terms of making it into a Simpson’s car 