Someone else was asking yesterday.
From all of the published info we have, it is not possible to do anything with the moons. The only interaction with them, in the CK, is the Climate-Panel you found.
I suggested going begging to the SKSE Team, to the other guy, just in case there is anything they can do to help ... Otherwise you are down to editting Cloud-Textures, or something similar, to fudge what you want to do.
(sorry

)