A fourth button?

[Deophite18]

Dunno if anyone has ever mentioned this, but it would be nice if someone made it so we had a fourth key to equip another weapon in. We only have A+S+D. S is sword obviously and D is for other various NPC's. It would be cool if we had a fourth one to equip a second NPC so we could use something like bombs+bow one after other quickly without having to open inventory. Im aware you can scroll with S+D without opening inventory but you can only go in one direction and sometimes the npc you want is on the other side of your inventory. It is pretty inconvenient.