I'm not sure what you mean by this BUT I really wanna look into it. I hated the collision box shadow that it has... I'ma go look after I post this BUT an elaboration would be wonderful also.
Not sure about DTS meshes, but when you export something with most programs (Blender, 3dsmax, Milkshape) you get several exporting options like include normals, apply modifiers, include edges etc. There should be an option to trangulate faces, check that. I've got no diea if this works for the DTS exporter, nor if it works for blender 2.49, but if it does then that fixes the shadow.