Not all lists are created equal; at the very least, not all lists are created for the same uses. It would be useful to be able to be able to define certain categories of list. Use Example: Creating views that pull from a lot of folders, where you always want to ignore the "Finance" lists. I have a few lists, that are not relevant to the larger views, but they are relevant to the folder they are in. It would be useful to be able to mark these lists in such a way to either exclude them from views, unless selected, or to have a tag / category system, that makes creating the filers on views easier.