Describe the suggestion you'd like
I'd like to have librarian villager trades not altered by this mod, so that they only trade vanilla enchanted books

Describe the reasoning for the suggestion. Balance? Fixing a frustrating mechanic? New Idea?
Using the enchanting table we can narrow down which enchantments to get based on which weapon/armour piece we enchant,
this isn't the case with librarian villagers : they trade any and all books which combined with the number of enchantments this mod adds, makes it very difficult to get the desired book trade.
This could be a togglable command option or gamerule if possible x)

Additional context
the wording of this suggestion includes loot tables of chests... could that be considered as well ?

I see your point, however, this mod is meant just to add more enchantments, but not change enchanting mechanics. This would be a great standalone addon/mod that someone else could make, but for now, I think I will keep things as is

fair enough, when i opened this issue i didn't understand how enchantments work in minecraft x)
so adding new enchantments makes them show up everywhere (loot tables, trading, enchanting table) and it wasn't a deliberate decision.
If you do know a way or any other mods to customise which enchantments appear where, i would love to know as well

Not aware of a mod, but getting the desired enchanting book from a villager is pretty easy. Just repeatedly place/remove the villager's lectern to reset his trades until you get the desired book.