I use the tag function very much to sort tasks in different contexts. One task can be in several contexts. For me, there more tags, the higher priority. There, would it be awesome to search for tasks that have a specific numbers of tags, and also create smarts lists with this.

For example: Show all tasks with "5 tags", and create a smart list with all tasks with 5 tags. Completing tasks in this list, will get work done in several contexts.