Cleaning up the node edit URL
This issue in pathauto Replacing node/XXX/edit to mypage/edit lead to this module: Sub-path URL Aliases give it a shot.


  The Drupal Path module matches only full URLs when creating SEO-friendly aliases. This module extends that behavior by also matching known sub-paths and replacing them with their respective alias. For example, if node/1 is aliased to content/alias, this module rewrites the link to the node edit page node/1/edit to use the aliased URL content/alias/edit instead. This also includes Views URLs taking a node as argument (node/%/yourview), in short, every URL that is based on, or extends, an existing alias. In combination with the Pathauto module it is possible to get rid of all remaining exposed internal URLs.