I finished my last playthrough some time ago now, so I think it's sort of academic. But I guess that depends what you're calling "character customization"? I've got a nude mod, and a couple of customized clothing items, but otherwise no - nothing that alters the eyes, and this was what I wanted to use to modify tattoos. I've got mods that alter the world as well in a few ways - replacing the billboards, altering the water texture, letting me change the colors of items in my wardrobe, removing cooldowns on super powers, and IdolNinja's extra cheats. But as I said, I'm certain there's nothing else installed that changes customize_player.vpp_pc.