1. Not sure, and I don't think it's a good idea, and I don't think it's needed.
2. I think it is already exported because it's object group is exported too, and so is the textures itself like a preset, so no need to add the texture files for a object in a map, when you check a custom map with custom textures.
Remember, mp3's are to be added to the download. Exports is to. So is sounds, and stuff like water textures and materials. Exports is very important though. But you need to add any custom water materials and textures, and sounds and music.
Hope this helped~