This is from XEnviro developer:
"Andrey Sheybak
October 3 at 9:32pm
Some changes have been made to our Roadmap reflecting the current project status. One noticeable feature of 1.08 is a general windshield preciitation effect that works on any aircraft. As I continue working on the cloud shader my colleague Vasily is making important adjustments to the atmosphere lighting and sky colors. Some issues with blending, haze and shadows will probably go through 1.08 and 1.09 until I finsh changing the atmophere model drawing order."
So, there is hope!