I think that if you ping during a automatic tourney during your match, it should be counted as a loss and you will be unable to re-enter. If you ping while sitting in the queue, then there is no reason that you should not be able to enter the queue again. There could be some problems with setting this idea up though. As of now the current system should stay until a better one is created. There are some people who legitimately ping, and then there are those who do not. Even the people who do force ping, are not guaranteed a win, so sometimes people force ping for nothing. As a side note, force pinging is against the rules, and is a punishable offense if you get caught. So if someone wants to force ping, be my guest.
Not supported unless a fair alternative method is found.