Use A/S Hold for Standardization
I was a fan of using AltA in the EC-135 until I began training GPS Copter approaches. Most pilots were unable to precisely control the airspeed at 70 KIAS during altitude changes and in large turns. Using A/S hold kept the airspeed at exactly 70KIAS making the required power adjustments for altitude control very predictable. From that point forward we trained to A/S hold for all non precision approaches for procedure standardization.