Yeah!!! It's a missing feature!
Believe me or not but as my Evernote database is growing and the shortcut panel is getting cluttered, I'm making some "Master Notes" to link to secondary contents. Table of content just doesn't make it.
Since "Saved Search" and "Tag Shortcut" is all ready in the interface, why not give us that possibility :).
Would be yet another "hidden gem feature" that doesn't really add any complexities to the UI.