One thing that some umps do that seem to mitigate the frustration coaches feel by "questionable" balls and strikes calls is to simply motion that the belt high fastball was inside or outside. Should they have to? Probably not. But coaches always think their pitcher is getting squeezed, and the other pitcher is getting all the calls. Calling a ball and holding your palm out to the right lets the coach know that the perfect pitch right down the middle, was actually a ball into the outside batters box.