CAAP advises
CAAP 5.23-1(1) July 2007
Multi-engine Aeroplane Operations and Training
states
4.17.9 Engine failures may occur during any stage of flight and could require considerable time flying around with a propeller feathered. Therefore, a pilot must safely manage the aircraft when in this configuration. Propellers should never be feathered in flight during training below 3000 ft above ground level (AGL).
and
5.5.1 .......It would be folly to simulate an engine failure at low level by selecting the mixture to idle cut-off or turning the fuel selector off.
and
5.8.1 Flight instructors often simulate an engine failure by rapidly closing the throttle or moving the mixture control to idle cut-off. The latter method should never be used at low altitude.
and
5.15.1 Engine failures after take-off must never be practiced at night. History has repeatedly shown that a disproportionate number of fatal accidents have occurred while conducting this exercise.
seems CASA now has it covered, but maybe no one reads CAAPs.
SB