I'm really enjoying creating my own discs using this mod, Here's some suggestion I think may get the mod to be even better

1- Disc Cloning (duplicate the disc)
In vanilla minecraft you're able to get a duplicate of a book by placing a written book in the crafting inventory + a book and quill, It would be great if yo can clone your disc by placing a etched custom disc aslong with a blank music disc on the crafting inventory to get a duplicate of the disc and share it with friends or just to have a copy in case.

2-Guide book
Many mods adds guide books to guide you trough the content of the mod, I had a hard time to understand how to use the album cover and the other items of the mod, like: custom dye for the disc, platforms that can be used, etc. I think it might be easy with patchuli?

3-Even more customization
This is maybe the craziest and less possible idea, but it might be great to have another layer of customizing the music discs.
The idea I had is that the same way you can dye the blank disc and the music label that you can use a block instead to mimic the design on the blank disc or music label.

These are all really good ideas!