Personally I do hope they will make anny character recustomization they add not for a fixed cost, but for a "pay crowns per change" culmulative cost.
It shouldn't be too difficult - re-enter chargen screen, add a small crown cost per slider/selector moved from "current" or other change (whatever that might be, thinking of stuff some people want like gender or race change, though that naturally would be a much larger chunk of crowns, cost-wise) to a running total, have one "revert to current" button and one "make it so and pay up" button... that way if someone recustomizes, and forgets a detail, they won't hate the game for having to pay full price again for that detail, but can enter recustomization again and again, until their character is -just- the way they imagine...

Extra unlockable options would also be a great way to add more varietee to the game. Be it through achievements (I'd really love to see some justice achievements unlock "tamriel-istic prison tats" body markings ), or from the crown store (how many people have asked for sai sahan style beards by now?)...
I'd also love to see purchasable structural options (say, a "titanborn" enhancement that allows nords to be taller then even the sliders set to max allows right now... stuff like that, allowing some races to exceed some of their usual sliders. A super-short short "oh, I am half bosmer" altmer for example... or overly musculed "orc smash!" hulking orc bodybuilders? whatever people would pay crowns for...)

I know I would make use of any recustomization function, either way... many of my characters have small details that looked all right in chargen, but I later found suboptimal for my imagining of the characters in live game... a hip shape here, a body marking there, a voice here, a skin color there... even a character name or two, to make them more lore-conforming for Orcs and bretons, for example... and at veteran ranks and many months of research, rerolling isn't really an option...