Serverpack Priority adjusts the loading priority of all server resource packs to be just above vanilla textures. This allows you to use texture packs that complement the server's resource pack. A good example of this is overlaying Fungal Pack, which improves the noteblock sounds. This works really well on servers with custom noteblock music, such as Wynncraft. As a nice bonus, it also allows you to move server resource packs, but these changes don't persist yet. This is something I hope to add in the future.