I would really like to be able to toggle during different types of lighting while working on my characters appearance. It can really make a big difference and it is frustrating to buy an appearance change token, spend a great deal of time and testing of options, rotating the character this way and that, until you think you’ve finally got it, only to have them look totally otherwise in the sunlight of Tamriel.
For initial character creation, this isn’t such a big deal as I can screencap my sliders and then delete and start over. But lighting options would certainly be welcome there too!