So... We do know what texture don't have config files. I just compress those now. The real problem stems from GUI textures, and normal maps. If the texture is named ending in _NRM or has the normal map MBM bit flag set, then all is good. Otherwise, we have to know to convert it to a normal map and set the Boolean flags for the texture to let KSP know that it is a normal map. The only way I have found how to do this currently is in the logs. I've toyed around with trying to hook into the part loading to detect normal textures there, but so far, no luck.