MY RESPONSES:
1- pilots that only fly or land, left hand circuits ..Sooner or later,this will get this pilot into trouble
2-pilots that only fly or land right hand circuits ..ditto
3-pilots that carry on board propane ..definetly can cause a nice fire in the event of a crash where the propane gets released and ignites
4-pilots that can't trim their own plane .. should not be flying jets
5-pilots that use brakes mixed with elevator, they should learn, how to use the rest of their fingers and have a dedicated brake channel. There is some merit in this but some pilots may not have enough channels in their systems to allow for a dedicated brake channel.. if THIS is the case, then you can use a futaba SR10 servo reverser OR a Smart-FLy EqualizerII that allows 1 channel to control 2 servos ( elevator, aileron etc) THAT could free up a channel for brakes!
6- pilots should only start up their turbines in a dedicated start up area. Not all clubs have such an area but the idea has merit
7- pilots that don't bring a fire extinguisher to the start up area. This can definetly save a plane...

one more...Pilots who over power planes and try for mach 2!