With the move away from commerial operation of MEPs then the 30 hour requirement, which originated from European Bureauracracy rather than any sensible reason has shot the industry in the foot. It was not so many years ago that if you held a ME rating (no mention of piston) you could add the ME FI and instruct and even examine if you held an Examiner Authorisation. I am not aware that there were any safety issues that waranted the 30 hour requirement and why 30 hours MEP rather than 30 hours multi, the asymmetric bit is the only area of concern.