That's too bad... is it possible to do a workaround so the mipmap of the texture of the original model is used as new base texture for the lod model?
That would spare quite some video mem, because smaller extra textures don't need to be created.

Does this even make sense? How is the frame rate affected if I use the same big detailed texture for all lod models belonging together? Since they are further away, a mipmap will be used anyway...