Cameron White

I think something like this should work:

If you inspect the foot locking channels, some of them never return to 0 so the foot is always planted to or blending out of the original position. The target position for the IK only resets when entering a new region where the foot is planted

I'm not sure if doing it in Python will be very easy, since SOP tools for editing the clips will probably be much easier.
To explain further - the agent's rig only stores the topology of the skeleton (e.g. which joints exist, and the parent/child relationships), and a rest pose that's used only as a fallback (e.g. if the agent doesn't have any clips assigned). There is no information stored about bone lengths etc, so if you're trying to make changes like that to the skeleton, you actually need to instead be updating all of the agents' clips