Please add this feature. In our system since a document can belong to multiple high-level categories we have to make sure that each document has a corresponding tag for every category. For example, Design and UI to get UI design documents.
I would prefer not to ctrl+click but just select and unselect as you click on categories.
I'm putting together a document library for operational references and am using categories for three primary types of data: Audience (ex. network), Type (ex. break/fix), and Status (ex. draft). Though it's easy to select multiple categories when editing a document, I can't find a way to filter by more than a single category at a time when viewing the documents list. Help?