Here's a possible idea?

If possible without a reboot, only make it open while you or another IMP that can monitor what takes place is online. That way if someone does a certain part of the tower and then someone else comes along and does the exact same thing without doing any actual observation or taking the normal logical steps, then you know something might be up and you can transfer them to the RotD for a little "chat". Also, if possible make it so it creates a seperate log, so if, lets say a group starts out while you're online, but you have to go, that won't necessarily kick the group out just because you have to go because you can just look at the log files quick and easy.

Perhaps make a global echo announcing when it is open or closed, so that way people will know and others that just logged on can ask around. Also perhaps set up an alarm at the entrance or something so you will know when someone is entering it, instead of having to monitor it off and on waiting for someone to enter.

And if information sharing gets too out of hand, well you could probably find out who was sharing the information and then give them a warning the first time and ban their ip or something the second time, seeing as how you put a #### TON (not just a normal ton) of time and effort into this game to make it enjoyable for everyone, but then a couple of people just have to go #### up all the effort you put in.