I worked at Arby's in high school and once an order had been paid for, it could be cleared from the screen at any time. We technically were not supposed to clear it until the order had been handed out, but people did it all the time. Most of the time, when we had to ask somebody to pull forward, we would upgrade their fry to a large or throw in a free shake, etc. for their trouble. I think it was kinda silly of them to make you pull forward just to cut down on their times, but I don't think it's that big a deal.

On a totally separate note, I'm surprised the school would allow you to bring fast food for your kid for lunch. Many schools won't even let parents pack a cookie or a candy bar as a treat in their lunches, but fast food is okay? I'm not saying you're wrong for wanting to give your kids BK once in a while, just trying to understand......