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As for the cloud details, it has always been possible to create your own cloud details in the FE. The problem is that this is slowing down render speed enormeously and the FE itself is getting hard to handle (slow response).

So am I getting this right: You can influence the shape of the details that are added with the "Detail amount" slider with the function editor? If so, how? The only place that I knew of where you could use the function editor for changing the cloud's appearance was the density profile, and that defines the "places" where clouds appear in a cloud layer, but not the details's shape.

Please enlighten me :-)