Why is it that i can't remove earth's water but i can for other non-solar system planets? And another thing... earth's clouds don't move or change shape like celestia? Will future versions include all of these?
Earth's water is part of the surface texture, not generated separately like on procedural worlds, so it cannot be toggled.
And Celestia's clouds never changed shape. You can have Earth's clouds move if you want, by specifying it in the catalog file. Their current configuration exists only to provide the most realistic appearance.