Visitor/Mob interactions

My realm has a very large Redstone RPG in it, It would be insanely helpful if you added some item that when it's in your inventory let's you activate spawners, be attacked by spawned mobs & kill unnametagged spawned mobs. This feature would add so many minigame possibilities and is the only thing holding me back from making a Decked out Spin-off in my realm.

Please pretty please add it, 100% my most wanted feature!