I've done both, meaning yelling "sit down" and politely talking to a team. In Lunacy I had 973's scouts count the number of balls scored and those in the trailer at the end of a match, so any time someone stands up could be a serious problem to the accuracy of the data. I only resort to the yelling if it's not the first time I've had to ask someone to sit down, I'm not perfect, I get frustrated.
The teams that yell and scream are a different issue entirely. It doesn't interfere with data, and while a little annoying if they're yelling while their own team isn't on the field, still understandable for the Spirit Award. I hope I'm not the only one who wishes that there isn't an award for who can lose their voice first though.
