Sounds fine to me. I've taught my daughter not to run in the library, and not to yell or speak in a loud voice. I've also asked her not to pull ALL of her books from the same section of staff picks because then she decimates the entire display that someone worked hard on.

(like she's not allowed to check out 6 books about Valentine's day, or nobody else would get any.)
The kids section is pretty well separated from the adult sections and the study tables/carrels, so they make it pretty easy for us.