Hmm...Yes,in addition to the 3-d traveling cumulus an additional high alt stratus layer.
Only a laymans hunch ,but I suspect a 2-d bitmap stratus layer would not be much of a system hit at all to add!And imagine the 'depth'it would add to the already very impressive new screenshot I've been oogling over!
Perhaps in the next...next release?
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"SCREAM'IN PTERODACTYLS"