Here is my take on this topic:
1) The prescribed mechanics and signals are so partners can work with each other first time on the field and so players, coaches, and fans will know what the umpire's call is without having to hear the verbal.
2) Many umpires object to limiting themselves to these mechanics and signals because of everything from local custom to a built-in rebellious streak.
3) Non-standard signals and mechanics are evidence of a less well-trained umpire or one who basically doesn't give a damn about what his sanctioning body requires or recommends. He's gonna do it his way and nobody can stop him.
4) The fist-pounding serves no useful purpose. It communicates no information that the players need to have to know what they should do. It is no different from any other call of "ball". If there is no stealing, they don't do anything anyway. If there is stealing, the dead ball call works, is standard, and everyone understands what it means.
Fist pounding is hardly the only example of non-prescribed signals. It is, however, evidence of... well, see #3.
No one is going to change Mr Piano's mind, and if you browse the other boards on this site, you'll notice that his internet personna is at least consistent.
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Tom
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