Hi Zvonko,
Thanks you very much for your comments.
I should let you know that some nice updates are coming up in the next few days... particularly in regards to overall cloud and sky rendering. The next update will actually be utilizing a custom Unity skybox and some custom image fx so the setup instructions will be changing anyway and I'll do my best to make it more clear
Yes, there was a bug with the stars not showing up in some cases... this should already be fixed.
Splashes and puddles on the ground (with integrated SSR reflctions) is something I'm looking into for a future update since, as you suggested, they could add so much believability to the system. Snow build-up is something I'd like to look into as well, but this will have to wait a while until I get some other stuff up and running.
I don't have any specific functions for multiplayer yet, though I am planning on writing a few helper functions that would make syncing sky variables over a network a lot easier. In the meantime you can look at the coding section of the documentation to get an idea of what you can change at the moment.