When editing a *ShapeData block, there's a bit of a hitch. Right know It's known as Num UV Sets, this will probably change in future versions of NifSkope, but for now, this flag when set to '4097' enables binormals and tangents for the model. After that, you can rClick on the TriShape/Strips and do Mesh>Update Tangent space (as we did in oblivion.) edit: with an update in NifSkope, Num UV Flags and TSpace Flag have been separated. Looks like the TSpace Flag should be set to 16 to enable binormals and tangents. After setting this, you can now rClick the TriStrips/Shape and do Mesh>Update Tangent Space. This is important for any model that uses a normal map.