I can honestly say that I've probably do about 100 of these games yearly. During these games as an oficial I also approach them with the feeling that I'm a teacher as well. If the game has no cosequence(ie. not a tournament or league playoff, etc.)I usually will tell the players what they are doing wrong, hopfully without comprimising the rules of the game. Most times the coaches are a parent or less knowledgeable teacher, ect. who are just trying to get everyone some playing time and don't always have alot of practice time with the players. As the age group get older, if they continue to "play hard" and don't show an effort to heed my advice, there is no option but to call the foul. I hope this helps a little.