I have never seen any T/O pop up the power handle on a two handle car when the train was moving in full service braking above 5 MPH. There is no point in creating what would be a finicky plugin-driven feature for a mundane action that isn't even performed in real life.
It's like feeding a giraffe gold leaf-topped Black Caviar, it's possible, but nobody does it. So why have Zoo Tycoon simulate giraffes eating gold leaf-topped Black Caviar?