I am not recommending this but I have heard of people doing it.
Shutting the engine down in flight, stopping the prop. The glide is totally different (So they tell me) to the engine idling or "Simulated no thrust". The glide is usually longer, controls feel completely different. The prop takes a lot more stopping than what you would think. When I was training in the olden days the instructor (Ex British Army rotary and fixed wing) did air starts. He made me do a couple in 150 and 172. I have seen it done from very high up to landing, the engine was then warmed up to taxi back. I have seen it done so the aircraft rolls up to the tiedowns.