I've adopted the Blender direct to KSE since then, but I would definitely like anybody reading this in the future to know.3dsimed actually disables meshes from casting shadows, I don't know what the exact logic is (maybe some optimization that works in other games) but it's not about the normals as far as I know. It shouldn't be a step in your process if you can help it, 3dsmax/blender exported to fbx into kseditor is the way that gets support. And then in the other direction, CM showroom to fbx to 3dsmax/blender, as it creates the persistence files correctly.