RE: Simple training quaifications
We have a similar system. Each student gets a personal log on heavy-stock paper (the size of a 8-1/2x11 sheet, folded in half). Inside are the field rules (so there can be no doubt) and the back cover is a list of manuevers and techniques similar to those noted above with a row of boxes for instructors to initial, date, and grade (score of 1, 2 or 3 - did not exibit the skill, completed poorly, satisfactory).
We also check dB's of the student's plane.
There have been some interesting episodes where guests claiming proficiency have cleared the peanut gallery benches of even the slowest moving spectators. Our bylaws provide several means of grounding unsafe flyers, and we have a handful of buddy boxes (and usually a trainer) available for help or as a means of testing as needed. The range safety officer has the final say. New members are 'probationary' at a discounted rate for six months and after that they have full rights if voted in. A probationary flyer cannot fly alone (unless he left his car at the gate and walked his gear up to the field and flies without a frequency pin - a rule violation in itself), but each new member is assigned two mentors and loaner-mentors are available.