Well, I didn't have a chance to try out the weather tweaker yet, but I did finally see some of these new clouds while out on patrol. Here is a shot of the new clouds using the file from Dowly:
And, here is a shot showing the old clouds (not sure if they're stock or something changed with GW 1.0, but this was before loading up Dowly's new cloud file experiment):
At least this shows the possibilities of manipulating these cloud files - one thing I noticed though Dowly - your new clouds are very thin - most if not all the stars shone through them at night. Not sure if that's anything you did on purpose or not - actually a few stars shining through would have looked pretty cool, but it was a bit odd with as many showing through as did with this file. Just thought I'd mention it in case it was some setting you can vary.
I still think the possibility of having some random cloud formations using SH3 Commander would be a nice little touch to add - I hope Dowly or someone else with this kind of talent can make this work