I agree with Jason. We used to have rules in the rulebook that were very specific on penalties with no allowance for the judgment of officials. Those created so many problems that we changed & added sections to enable discretion. For this one in particular, I think it would be almost impossible to determine intent. Like shRedman mentions, there are methods to complain about rough riding and I know for sure that the board has taken action toward riders who exhibit bad track behavior.
Besides, as they say, "rubbin's racin'" ( for the humor impared)
And I know I've touched Tony Baker intentionally (and usually inappropriately).