I looked into the BVH output from Firestorm’s Poser.

1: Pose created from scratch in Poser

2: Pose exported as BVH from 1 and reimported

3: A commercially available pose

4: Pose exported as BVH from 3 using Poser

The current BVH output accuracy seems too low for instant copying to be a concern, but if accuracy improves, this spec could become a problem…