At our busy So CA field we have five pilot stations and usually three flying at a time. When somebody insists on doing 3D stuff in the take off and landing area nobody else can fly, period. If you are a good aerobatic pilot you should be able to do 3D and hovering just as well in the middle of the pattern. This is not an issue of tolerance, but fairness to all concerned . BTW, we have a separate chopper flying area, no problem there. If you have only a few flyers at your field and people really don't mind cooling their heels while you hover over the airstrip, please ignore the above.