Regarding clouds, I think Oleg mentioned some time ago that he hoped to hire a graphical artist/3rd part developer to work on the appearance of clouds after the game was released, as there were simply no time or resources to get them up to his personal standards.
Still, I think they are the best clouds we've seen in a flight sim, and will likely remain so for a while. Though they may not resemble every cloud type in the sky, they certainly do look a lot like some that I've seen.
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