Way beyond my own modding skills, but I know that Skyrim's game engine doesn't exactly facilitate it... The whole pseudo-hdr implementation is hardcoded, rather simplistic, and there are few and unnecessarily restricted ways in which you can actually influence it. The big overhauls are already trying to tweak what is available the best they can, each in their own way. (And each with mixed results in my opinion, so I just prefer to pretty much disable the whole effect without breaking anything, but I'm obviously biased.) It would be a real trick to give the game the unobtrusive, accentuating, immersion-enhancing eye adaptation model that it deserves.