SteveZ You can achieve a similar effect with the sliders added in 4.3-beta.
Sliders allow you to reuse animations you've created in other animations. So first create the stocking animation manually, then create a slider to use it, and in another animation animate the slider or map it to a bone. This way, at runtime, you can move the stocking by moving a specific bone via scripts. However, 4.3-beta is still an early beta release, so most runtime components have not yet fully implemented the new features of 4.3-beta. It may take some time before you can test the runtime effects, but you can currently use sliders in the editor with the latest 4.3-beta, so please give it a try.