--JawZ-- has a script for xEdit that deals with exactly the things I'd love to be controllable from the ENB GUI if we had an extender with something like a GetAmbientColorRGB/SetAmbientColorRGB, and so on for Ambient, Sunlight, Directional Lighting and Fog colors. THAT. WOULD. ROCK.
https://www.nexusmods.com/skyrimspecial ... mods/1377/?
edit: -> Its the second on the download section
You can actually edit that script a bit to work on Weather records and edit any values you want on batches of your weathers, fadingsignal
I sent a PM to him suggesting a conversion of that script to weathers, but sadly never got a reply.