Is it possible to mod customization options?

[sajberhippien]

It would be nice to add a handful of customization options for some of the races, but I don't know if it possible to do that and have them be available to non-donors; I don't know where the locking takes place, so to speak.

Since a lot of it would be pretty easy spritework, I could probably throw a few things together; a few hairstyles/colors, a few more skin colors, perhaps some variants on the less human-like races. Obviously I'd stay away from making the same things provided by donorship (e.g. I wouldn't make more beards for the female dwarves or other colors of mankinis).