the problem with a proficiency test, especially at the AMA level, is that you have to make it accessible to every type of plane. What if I want to fly my little 3 channel foamy around with AMA coverage? loops and rolls are out of the question, won't do either with rudder only and not nearly enough power or authority to loop. takeoff consists of a good throw, and landing is sliding in on whatever surface is near. (obviously touch and goes are out also)

Once again, very few AMA claims are due to planes running into stuff. most are 'trip and fall' or someone sticking their hand through the prop.