A true max rate avoiding action turn would most likely exceed 60 deg bank and therefore cannot be done normal cat. It could be done if the aircraft is utility cat (check W&B), but given the risk of inadvertantly exceediing 90 deg bank the exercise is perhaps better left to an aerobatic cat aircraft. Perhps the reason why it is not routinely taught at PPL level. A good exercise on a aero's or advanced handling course though IMHO.