Texture Pack Optional

Putting in 2 or more packs in a server would probably not be possible because Minecraft only allows to choose one for a server.

 

Maybe like, make the "Not important" Textures 2D, Like the bookshelves.

 

My idea was more along the lines of the 3d one is the default one where you download on logon, however the 2d one is downloadable and you have to turn it on while on the server. And put it above the 3d texturepack in the texturepack menu.

 

But you don't see the 3D pack in the menu

 

I think on 1.9 or 1.10 it does show up on the menu. I have almost certainly seen it on the menu at some point before.