When repairing a tool in the crafting grid with it's material, all enchantments are kept. I know that's probably intended, but I'd really like to hava a config option whether repairing keeps the enchantments or removes them like vanilla crafting grid repair.

Allowing tools to be repaired with their material instead of other half-broken tools sounds like a nice vanilla tweak to me.
But letting it keep the enchantments is too overpowered in my eyes and makes the vanilla repair mechanics (anvils and mending) completely useless.