Rotor Droop
Just to throw another angle on it.
Quote from the book
Exceeding the limits of 810c TOT or 100% may cause N1 topping with resultant rotor droop.
And all the beeping in the world wont get you out of than one!!!!
Can you imagine @ 50feet and the N1 starts to die a death.
I think the bottom line is that as a pilot if you are depending on the beep to give you another 2/3% on the NR to get you out of a spot. Just shut down and drive home.