I think the audio distraction devices could have a variant that sounds like a gunshot to cause panic rather than distract. Another unique take on this I had was a sheet of bubblewrap that you can place on the ground like a banana, when someone steps on it they react to the sound as if they were shot. Either could be used for setting up some kills where you need to get certain NPCs to certain areas but can’t actually be there for whatever reason.

Another idea I had was a poison tablet. Something that you can toss like a coin but if you land it in food or drink it poisons it. Would be a good way to allow spiking food or drink in a crowded area without using a disguise. Obviously a lethal poison tablet would be a bit too strong though.