Could you add a configurable option to specify certain tools that will break certain materials to allow an expanded library of hardened materials

ie
hardened dirt can only be broken with iron and diamond shovels
hardened granite can only be broken with diamond pickaxe
hardened andesite and diorite can be broken with iron and diamond pickaxe....

Thank you

It would make a great addon and would add some wonderful complexities to the gameplay.
A short while ago I discovered a bukkit plugin that does specifically this and it works... but it was made for 1.8 and hasn't been updated since 2014...

If you take a look at my spigot request thread I could update it. Gist mirror

Even if this would be PR'd, I'd imagine it'd add a lot to the config. Perhaps better suited for an addon for that amount of extensibility.

Oh, That gives me some ideas! I have a couple of smaller plugin ideas I'd like to talk to you about...