Wrinkly will your ES include landscape changes? Like snow on the ground during winter, different leaves' colors etc
No, that's not feasible/possible. It's the ES bit from EW/AN + seasonal day length variations + latitude based day length variation + seasonal vanilla weather system volatility. Nothing major really.
In more related news, I've been trying to fiddle with the colors of the fx meshes altered by LTBD to reflect light only. Vanilla has them emitting light, and LTBD stops this, but they don't reflect light, and adjusting the specular color in nifskope seems to have no effect (I don't know why), and adjusting the ambient and diffuse colors definitely won't have an effect as there is a texture attached. I'm a bit of a newbie when it comes to meshes/textures, so if anyone can give me any hints on getting stuff to reflect light only, that'd be great.
EDIT: The two textures used by the meshes I'm working on don't have corresponding normal map (_n) textures - would this have something to do with it, and do I need to create normal maps for them in order to get them reflecting light? I thought I once saw that mentioned on the CS wiki...
EDIT 2: I tried creating a normal map in GIMP - it kinda had an effect, looked pretty rubbish though. Looks like I'll have to learn more of this whole normal mapping thing. I'm only interested in the specular map though (alpha of the normal map), so any hints of getting that good?
If anyone is interested in lending a hand, the two textures needing normal maps are:
textures\dungeons\misc\atmospherecloud01.dds
textures\dungeons\misc\gascloud01.dds
They're really transparent, which is probably what's causing much of the issues for me - while they glow like crazy in vanilla, there's not much actually there to work with.

It's probably just me being a texturing newbie though.