These kids spend hours on the court each week, and we are concerned with a 15 minute time period? Like they can't dunk like madmen for an hour before you ever see them. Warm-up for practice every day when I was in high school was an impromptu slam dunk contest - not that my 5-7, non-jumping @$$ was ever in it! I should add that this was sophomore year on because dunking was illegal my freshman year. Once they made it legal to dunk, they by default said it was safe.
I have to admit, I have never seen this as a safety or equipment issue, but one of policing hotdogging in the name of sportsmanship (Probably by a bunch of people who don't like behind-the-back dribbles either
).