I, too, vote for tag inheritance. In the meantime, here's a trick I've come up with for tagging multiple items with multiple tags. Say you have tag="Red Sox" and subtags "Ortiz" and "Varitek." Now, if you have created a bunch of notes tagged with Ortiz and/or Varitek, they will not have inherited the parent tag "Red Sox." Here's how you can quickly tag them all Red Sox. First, select any one of the notes tagged with Ortiz and/or Varitek and tag it with "Red Sox." Then select all the Ortiz and/or Varitek notes with the select all (using Ctrl+click, search + select all, or whatever method). No