That's exactly why I'm here ... ours is a small independent league that's growing and our umpires are high school kids so I don't expect them to have the rule book memorized, but more common areas of contention they should know about I think ... like what comprises a balk, what's the infield fly rule, when can a batter run on a dropped 3rd strike, etc.

Funny you say this. One thing that irks me is how often after a walk, the coach yells time and just starts walking toward the pitcher. Nevermind that the ball is live, runners can run, etc.

As a coach, I always make sure I GET time before I do anything (like walk on to the field). The incidents where the ump called time early I was sending my runner (who had just got walked) to 2B, but time was called by the ump, stopping my runner at 1B.

I would have them keep running. perhaps that would drill the idea of not calling time into the umpire's head.

I make a habit of putting up the stop sign when I hear time before play is obviously over - but a great many coaches walk right through it.

But if the ump calls time, everything stops, correct? No sense in sending my runner and tipping my hand

At the higher levels they won't run and everyone knows it so it doesn't matter. I've seen MLB umpires do a ball exchange with the catcher before the runner is even halfway to first.

How else will you train the umpire?

Well ... not sure it can be tipping your hand as to what you might do later, if you'll never be able to do it later...