So, I had a question pop up from a while back about In Star Trek why is there a kill setting on phasers? and it made me remember an offbrand Choose Your Own Adventure book that I read somewhere in the 80s or 90s. It was space-based and I remember that you got a phaser (or similar futuristic pistol) and they frequently asked you whether you were using stun or kill, but the result was almost identical in each case, only varying in two cases, one where you got a bad ending for using the "kill" setting (because you needed the humanoid target alive) and one where a beast was charging you and if you used the "stun" setting, it bulled right through and trampled you. The other thing that I remember was that there was a high-tech helmet that you could choose to wear. If you did, you gained a point or two to your Intelligence score as it boosted your intelligence (I actually want to say that there was a random chance of it instead killing you or lowering your intelligence score).
I'll be honest... I'm not 100% certain I'll even recognize the books when I see them, but I figure it's worth asking.