It would be nice, if we could decide which /dank/null tier is available.

For example only the diamond/emerald tier

B:EnableRedstoneTier=false
B:EnableLapisTier=false
B:EnableIronTier=false
B:EnableGoldTier=false
B:EnableDiamondTier=true
B:EnableEmeraldTier=true

These options not only deactivate the recipes, they also ensure that the respective Tier is not registered.

no...this would cause confusion with the metadata used for each tier

After a short amount of thought, I will add this. This will just delay the next update a bit. In 1.13 meta data will be gone, therefore I can get a little ahead of the game now and prepare for that..this would allow for such a config to exist.

this is possible via other mods in 1.12 and I just dont have the motivation or time to implement such a feature