The one time I saw this and would have called it a violation there wasn't a rule preventing
it, so, no violation, just maybe a little dirty.
Corey Deuel was playing and always racked the 2 and the 3 in the same place. He really
controlled his break and would generally make one of the wing balls or the one, use the
2 to get shape and the 3-9 combo in the bottom left corner just about every time.
I thought it was clever, but not terribly sporting. I guess your responsibility as a player is
to win, within the rules of course. I suppose to win you would try to remove the element
of chance, ie - if you can control the game, you can control the outcome. He did just that.
Within the rules, yes, but maybe not within the spirit.