i would suggest making a different graphic for the black dragon scale vs ender dragon scale, while the ender dragon scale is verrryyy slightly purple, its too difficult to notice, and i see people getting them mixed up for the same item a lot of the time. Perhaps it could be tinted a bit more purple or some purple lines or something to better differentiate it.

another suggestion is if we could possibly get some config options for things like drop chances of the bezoar from cave spiders and such, would love to tweak those to my liking.

This can be achieved (though it's obnoxious to work with) with Loottweaker. You have to disable mob drops in the config, and then re-add them manually in a Loottweaker script with whatever drop rates and conditions you want.

Personally I'd like the config options to disable individual items from being added to the game and options to remove individual items from loot pools rather than all-or-nothing. My issue is that I have other mods that drop their own dragon scales, such as Mystical Agradditions and Quark (which I've disabled), and in order to disable them I have to disable all loot drops and re-add all the others with Loottweaker since the scales can't use the ender dragon loot table to drop.