As far as coaches talking to parents, it is a good idea, I think. I'm really lucky to have a great group of parents who are very supportive of the team and their kids; they bring a lot of much-needed enthusiasm to the game, and like anyone, sometimes a couple may get a little carried away with best intentions. It's just a product of the intensity of the match and wanting to be involved. Still, at a recent game, an official commented to me that the fans were getting a little abusive; it only took a second and a gesture to get them to take it down a notch, and the rest of the game was played out without incident.
Most parents who attend matches are great people who are there to support their teams, not cause problems for the players or coaches; just taking a second to communicate with them about how they can help or potentially hurt can make a lot of difference in the environment of the game.
