It looks like this command is not working with all avatar types. I just tested and it works with the
head and hand avatar but not the
mark avatar. You should be able to get the same result by applying a scale factor to the tracker links instead:
Code:
trackerLink = vizconnect.getTracker('head_tracker').getLink()
# Scale movements along ground plane by factor of 5
trackerLink.postScale([5,1,5])