Actually I just discovered something pretty cool. It turns out smoothing IS being preserved when you export .x from Maya and import into Ultimate Unwrap, but the mesh is ALSO breaking along texture seams. So in Maya just eliminate all texture seams (eg. map the entire model with a single planar map,) export to Ultimate Unwrap, and do the texture mapping there. This way it'll carry over the smoothing information but without any additional edges from texture seams.
Maya > Blitz3D probs
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