one trick, a lil more work. 

add a primitive as a control prop, parent the camera and the teapot to it. 
use the control prop to rotate the teapot and camera as needed,
but move the teapot only when you want it to wobble without the camera.

n/m.  didn't notice right away you wanted billboards to face the camera.

i use the control prop method for when ships tail spin, but want the camera to follow without doing the blair witch project thing  :)

---

♥ My Gallery Albums    ♥   My YT   ♥   Party in the CarrarArtists Forum  ♪♪♪ 10 years of Carrara forum ♥ My FreeStuff