What reason would a student have for practicing emergency landings? Is he able to evaluate and critique his decisions? That's the instructor's area of responsibility, and should be introduced early in training in conjunction with perhaps turns around a point to show the student how to judge wind direction.
As far as spins, definitely should be demonstrated after being explained prior to flight.
One of the very best maneuvers that will have a big impact on instrument flying skills is slow flight, straight ahead to start with and then introducing standard rate timed turns along with 500 fpm climbs and descents. From this maneuver is a great place to kick some rudder and induce a spin, you will get a real good look at your trainee. For him to practice spins solo, NO WAY