I don't speak because of my knowledge, but from experience.
In my job, I operate hot and high, (10-12 K DA's) and the helicopter I fly is usually limited either by Torque on colder days and TOT on warmer days.
The helicopter has a NR 100 to 102% switch, you are supposed to use 102% for Takeoff and Landing, always.
But on warm days, we will not use 102% because it will raise the TOT to the point we wouldn't be able to take off without reaching the TOT limit. Some argue that that extra 2% helps with the take off, it doesn't, and it just gives you less TOT margin on Hot and High conditions.
Now what that extra 2% will give you, is a little more pedal authority, a little, but every bit helps when you are short of it.
The aircraft I am talking about is a Agusta 109E.