Concerning the possibility to add other folders: it's  not a problem, I just have to think about two things:
- find an elegant way to add as much folders as we want
- find a way to decide the kind of bitmap that has to be mixed with the skin:
    * white backgrounds, such as Shana's is a method (multiply)
    * black and transparent backgrounds (probably something like "add")

Now that I'm writing this, solutions are slowly popping in my mind 

When it comes to freckles: well, I have to look if there's a blender-like solution that could be either used or adaptedb, as because of copyright I can't use or adapt the script pointed to, except if the author agrees.

Anyway: good ideas  

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