Record for instance a GMG Ifrit called "Ifrit", moving and firing using by using BIS_fnc_UnitCapture and make the AI replay all this with BIS_fnc_UnitPlayFiring and BIS_fnc_UnitPlay like in this tuto: http://www.youtube.com/watch?v=ovfKS1l5EQc
You should notice:
1) No engine sound (in fact this can be fixed by starting the engine manually before starting to play the move)
2) GMG_40 not firing in the right direction
In the attached example mission, when the Ifrit stops, it fires only in one spot, which is not what I did when recording. It does not launch a smoke screen either when leaving the area, while I did record that.