Would be great for coins too. The Funck catalog is ordered alphabetically by city, so most of us likely store our coins in the same order, not by state.
Maybe it would be good to have a new display option that was in alphabetical order of the final issuer, regardless of the state it belongs to, so you could have all the issuers (especially from the Notgeld sections, not just Germany one) followed in alphabetical order. I don't know if it's technically a viable option.
Then, when you search by alphabetical issuer, the order would be something like this:
Coin referee for: Andorra, Equatorial Guinea, Marshall Islands, Moldova, Liberia and Spain
Banknote referee for: Andorra, Equatorial Guinea and Spain