I'm not that fond of putting it into the prompt, primarily for efficiency reasons. It's very rare that you need the information (almost all rooms aren't graveyards), and it'd be just one more thing that gets checked every time you move.
More importantly, I think it detracts from exploration to have it on autopilot. I like that the current system allows you to read a roomdesc and think "this place might have enough bodies buried..."
I have a compromise in mind that should solve the first problem without compromising the exploration issue. Watch this space.
