It does not already exist, don't worry...
My design for the layer stack is based on art programs, where the order you see is what you get. Adding a z-order option would break that, as soon as one of the layers has a custom order then you can't just look at the list and see what's what. There's also the issue of moving other layers around, should the custom z-order change or remain static?
For now, we have a few options:
- RahiTuber doesn't store an image more than once, so having identical layers won't affect your performance unless you're actually drawing them more than once. With that in mind, you could actually make a folder for each expression with the entire model in each, and just hide/show the folders.
Currently that would come with its own awkwardness, because duplicated layers still retain their inherit/clip options as the original layers, so you'd have to manually change them (I've got an option to change that in the future)
- another option is for me to add a filter to the state layer list, so you could just search "hair" and see them all together.