Thanks for the common sense answer, turbocoach! When my DD was younger, she played middle school basketball. Now, you want to see something hilarious, go to a middle school gym, and see how quiet it gets during free throws! You'd think Tiger Woods was preparing to make a putt to win the Masters! Quite different than the noise in high school basketball.
Give me a break! I taught DD to focus on the rim, and the rim ONLY. I would wave my arms, say "miss!", etc. trying to distract her. Nothing obnoxious, just minor distractions, like talking to her while she was shooting. I'd tell her, "Now this is a REAL important shot, if you miss, I'll win, so reaaaalllly keep your focus!"
Soon, she just ignored the old man - nothing I did would bother her. Then she started beating me at free throws!
A unique twist on this would be for you coaches to wear one of those obnoxious neon green shirts the next time you throw batting practice. If you've really got guts, wear the green shorts too! Moral to the story - the kids who've been exposed to less than ideal conditions will have a decided advantage over the kids who have not.