Sorry guys for being so inprompt but lets put the the ballsand ego toone side for a second and think about this.
One thing which much be remembered is that we a simulating a failure and as a M/E instructorshould never cause an intentional failure. If your argument is so that they close the throttle WHO CARES???? REALLY? Is is so critical that they will remember on the once off? just look a sim check rides... how many pull the wrong fire handle under the pump?
Secondly, If you willing to risk your life that the student will handle the situation correctly... well good luck and I wish you all the best, but will you put you Life, friends and family behind that one?
Thirdly, As for reducing engine ware and tare..... I think its a whole load of brown stuff. You run an engine at 350 degrees and make it feel 22 degree air in the space of a few seconds..... now lets see who has the real failure (forgetting a geared engine).
Just some common safety tips fellas.. what you do is your own life