Dear developers, it might be worth making the enemies react if the player starts placing barrels and bombs near them, as if they were reacting to illegal actions like theft. You place a barrel near an enemy within a radius of, say, 15 meters and he tells you to stop otherwise he will hit you on the head with a hammer (Especially if it is Dror Ragzlin, who would probably hate players with barrels). You can also limit the throwing of things during combat and the transfer of things between characters’ inventories during combat, so that a bonus action is spent. For really hard difficulty, you need to prepare your characters in advance.