Currently if you want to add a tag to a piece of content you have to click Edit, add the tag and type is a reason for editing the content.
THE IDEA: Make tags editable without having to actually edit the content. Tags can be added to permissions as another set of check boxes  Edit Tags,  Delete tags,  Update Tags. This will allow community managers to assign tag editing to specific roles.
USE CASE: We host a product support community that receives over 500 new questions a month. Many times the users forget to tag their question with the part number or they leave off another helpful search term. We spend a great deal of time updating tags and it would save time to be able to quickly add tags without having to edit the content.