One that comes to mind is an actual engine off landing. Not sure about GA but in RA world it can only be done with the CFI on board (from memory).
Don't know about RA but you must practise engine off (idle) approaches if you are to have any confidence in carrying out a real one. You will become rusty or very rusty without some practice.
Stalling doesn't require the same amount of judgement and calculations so, while it is good to practise, doesn't need so much.