Sorry guys, I forgot to mention this. Years ago when the pros played with the PBTA Rules, during the same era that Pat Flemming sat high in the ranks(PBTA Ranks, not player rankings), I think he was President, it was most definitely a foul to tap the object balls while racking them. In fact, the racker would lose that rack and the next two, just like a concession. The explaination for this was that it was disrespectful to the host's equipment, just like having to keep a foot on the floor while shooting, either violation, though not often, could possibly damage the playing equipment. Perhaps Blackjack or another player of that era with an actual copy of the PBTA rules would care to validate the above statement. I know it's true, I read it with my own two eyes.
As a footnote, I was playing in a tournament where we were using PBTA rules and it was a handicapped event very close to the finals. I was spotting the guy that I was playing, but he was clearly on the steal, and most definitely should have been spotting me. I was getting burried, but managed to work my way back into the match and was only down a few games. I was so mad that I insisted that he rerack the balls over and over again until finally he grabbed the cue ball and started tapping the 1. I immediately called a foul on him and we went to the tournament director. Before anything was said, I made him admit that he tapped the balls and then I was looking for compensation from the director. The director had to verify the rule, which he did in a copy of the PBTA rules, but then did not enforce the foul because it was an 'obscure rule, not coverred in the players meeting.' I of course was outraged because we were supposed to have been playing PBTA rules, and there was the rule in black and white. Oh well, I tried to get over and failed.