This is the reason games take a long time. I just tell the kid to stay in the box and they stay in the box. There is no reason for batters to step completely out of the box to take a sign. I remember I told people that many of my games took less than 2 hours and some did not believe me. It is stuff like this that keeps the games long. You do not have to be an *** about it, just tell the kids to stay in the box and they will listen.
Do not get me started about activity in between innings.
Peace