PS: many interior models also have a "NORM" section (trailing the TMAP), which contains the normals for the model. Pack3D doesn't export this either. Without this information, shading and curves are not as accurate ingame compared to in your 3D editor, because the engine will calculate normals based on adjacency (let's not get into this...). This may not give the expected results when using low/medium-poly objects, especially for curves...
Many larger models (viewed only from a distance), iow. pretty much all exterior models don't have this data included in the game as shading from far distances is not required to be so accurate to still look good.
As some of you may know or not know, a tool to help you with all these problems is in the works. Maybe DD succeeds doing this manually (I hope so!), but just remain patient for my tool otherwise. Him and me are on close contact on these issues, so it's only a matter of time before I can release my tool.
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