Yeah, that’s a good idea/point. I’m thinking about adding a feature where users can upload assets to a category (e.g. hairstyles, headwear, etc.) and add options to categories that way.
The included customization options are stored in the art repository on GitHub, which you can check out to familiarize yourself with what the assets actually look like under the hood.
I’m planning on setting up a contribution guide so that the community can add customization options to the official program as well.
If you want to formally request what you’re describing as a feature, you can do that by making a new issue in the main TDSM repository.