Assign functions per file an ID, and then you can optionally just specify an ID instead of defining inside something like the noise: key, then with #61 it could use the noise ID instead of noise defined in the pack manifest.
This would allow a better way of sharing noise functions too, while also reaping the drag drop pack merging benefits of #81.

Could also be hooked into the noise tool, such that you can easily just open up a pack, and have easy access to modify individual noise configs.