Minecraft Version: 1.12.2
Inventory Tweaks Version: 1.63+release.109.220f184

I use Quark, and Quark has a favouriting system that prevents its items from being dropped off from its drop off function. I want to also have that same favouriting system keep items from being sorted by Inventory Tweaks, but I don't see any way to do that.

The NBT tag Quark uses to designate favourite is {Quark:"FavoriteItem: 1"}. The current InvTweaksRules.txt is built for inventory slots, not item data, and the InvTweaks.cfg has no blacklist, so this is currently impossible.