Merely a suggestion for a future build:

 

Would you be able to include an option to make the cirrus deck randomly appear- like maybe based on certain weather conditions. There is nothing in a metar that would indicate the presence of cirrus, but maybe we could have a system like in Activesky, where say, they only appear 30% of the time. Currently, I have a cirrus deck no matter the weather or conditions. There are clear days with cirrus, and clear days that are glass clear with no clouds.

You can disable cirrus yourself or configure it to appear at a random altitude between two configurable levels. Not sure if having it randomly appear would annoy people.

Gotcha- so it's either manually on or off.

Yes, it's all in the Weather dialog.