I like the idea of tripwires, but to me that seems more like a tool someone would use against thieves, preferrably attached to some nasty (semi-)lethal contraption. However, doors? They only open when someone wants to pass through them, so attaching a gas mine to the jamb or doorhandle seems reasonable to me. Like the wall-idea, this gives it a more plausible vertical position, and no proximity detection is needed. The door opens, gas goes off, and you can be pretty sure you're going to hit someone. I was going to suggest rigging something to the doorhandle, but then I noticed that not all openable doors have door handles, so maybe attaching to the jamb at head height makes more sense. I don't know anything about the code base, but I guess the problem here is that this would require collision detection between the mine and door. If it's attached to the door/jamb instead, the open-door trigger could also trigger the mine. If the item is nonremovable without setting it off (really sticky glue?), you can also manage to really mess things up for yourself if you booby-trap a door you need to use for your escape. If the item is detectable by the AI (light-level?), it should also matter which side of the door it is attached to. Not remembering which door is booby-trapped gives yet another way to mess things up. (First post, I know. I've played quite a lot of TDM but usually do not have much to contribute to the discussion.)
