It was mentioned above: interrogating enemies. Its usually assumed that all monsters and bad guys fight to the death, but occasionally they are captured. Then it turns into "what horrible torture can I inflict to get him to talk." Maybe I've just got twisted friends, but every group I've been with has had no reservations about cutting off fingers, or cutting one orc's head off and taunting another one with it.
The other thing missing is noises beyond the room you're currently in. If there's a banshee wailing in the room on the left, apparently the PCs don't hear it until they open the door. And conversely, the guards in the next room don't hear the PCs fighting the troll in the courtyard. Return to the Temple of Elemental Evil did okay at this, but generally its lacking.