Is there a certain location where you are having problems?
The penalty for a dad being on the sideline without a badge is for the dad to get put in the stands. If he is yelling at the officials and/or causing any problems the unsportsmanlike foul would go against the head coach as he is responsible for everyone on his sideline.
Site managers are at every site, that I can assure you. If you are actually looking for one, I am fairly certain you can find one if not more than one.
Again, if you are seeing a problem at a particular site please let me know.
You made my point with the Glenpool example - I am guessing that was the site manager at Glenpool that made sure no one was on the sideline without a badge, not the officials?
If a "coach" is causing problems, the first thing an official should and will normally do is look to see if he has his badge around his neck. If he doesn't have one, he will be removed from the sideline.