I was thinking that since our vaults and shops let us create sub-categories, to add another level of organization, maybe we could have this ability for our Wishlist.

Example:

{o}Custom Wearables -Backgrounds -Foregrond -Wigs

As far as I'm aware, we don't have sub-categories in anything. This would be a whole new level to set up and, I think more complicated than it needs to be. If you need more categories for your CWs, then make CW-wigs, CW-backgrounds. I've got a RARES category in my wishlist, but it was too big, so I broke it down into 3 separate RARE categories.