1st suggestion: I don't think this is possible. I'm pretty sure that the ground of skylands is just transparent and theres a source of reflectance coming somewhere. Slate moving grounds has a ground with a texture on it that is constantly moving in a certain direction.
2nd suggestion: Possible but I doubt it could become default.
3rd suggestion: Possible
4th suggestion: Possible
5th suggestion: Both emitters are possible
6th suggestion: This could probably be included in One Random Brick Pack. And yes it is possible.