The only difference is a different sub type iirc. Something like 0x8005 and 0x8000. I had to name it v2 because of that difference, but the controller is the same other than that. [edit] this difference I think had to do with being attached to either crew or just static objects. But I don't think the engine really cares whichever version you use.
This controller can be used to animate the UV-map. The 3D model is then fixed. A prime example is the coffee-damp above the mug in the captain room (look it up and play the anim).
[edit] To try it out yourself, make two different UV-map layouts on the same model, and import it. You can get some crazy effects this way when warping the texture...
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