Search by Rating

Could you please provide a Search by RATING? My kids always want to watch movies and always ask for ones that are too old for them. I would love to be able to go to a list of possibilities immediately that are, for example, all rated PG. That at least narrows down the search for me by a lot! Given that all of the ratings are already listed, it seems it would be a pretty easy addition to the site and so beneficial, especially to parents. Thanks!