Against the rules? Seems like griefing to me.
[HP=422]:use steel key s
You successfully unlocked the door.
[HP=422]:open s
The door is now open.
The door to the south just closed.
[HP=422]:s
The door is closed!
Edit: To clarify, I don't expect a free ride off your steel key. Open the door, go in close and lock it behind you by all means. However don't close it when I reopen it with my steel key. Don't want people in the treasure room, kill Leo every 2 hours (at keys since he is a quest boss).
Yeah that's pretty close to griefing...