I'm very surprised it's not in the game already, with all the focus on creative problem solving, multitude of viable approaches both systemic and scripted, the "n+1" problem resolution philosophy... It just discourages the player from any kind of creative/clever/skill-based solutions and pushes them towards murderhoboing. Now, I don't think murderhoboing should be actively punished, but it shouldn't be "meta"/an obviously superior solution to every encounter. BG1/2 weren't perfect in this regard, but they generally did a good job of rewarding various playstyles.