Age Rating Filter should Allow Multiselect

You should be able to select multiple Age Rating when searching. I rarely want to only find PG-13 movies, but often want to find movies rated up to and including PG-13 (for example). Often I would want to exclude Unrated or NC-17 movies, but currently you have to pick a specific rating.

Allowing multi-select (similar to genres) would make a lot more sense.