Hidden Puzzles

[MasterWuuf]

I have noticed a few places in Dungeon Master that can be bypassed without really keeping a person from finishing the game.
The speedboots behind a number of fake walls is one.

My latest question is about the floor plate in the room that is opened by taking a large number of steps and turning around to see the wall opening.
There is a floor plate that doesn't seem to do anything.
I have heard it will activate something if you can get a group of mummies or skeletons 'frozen' on that plate.
I've never been able to get it to do anything, so I'm asking if anyone has some information about it.
Thanks ahead of time, if anyone has some usable input.

P.S. After all my years of DM play, the mummies scared me twice this time. Ha. Gotta love this game!