I Feel Naked Without It

The third of the ten mods every pack on 1.12 should install, no questions asked.

The mechanics of the vanilla cursor in inventory GUIs leaves a lot to be desired. MouseTweaks adds several contextual functionality improvements that have become so natural to use that I literally cannot play the game without them anymore. Moving items to and from inventories and quickly making crafting recipes are so greatly improved with this mod that not having it in a pack feels like a cardinal sin.

If you've made it this long without using this mod, please remedy that immediately. It will change your life (or at least the way you approach moving items around in your inventory).