I'm not sure if this is best practice or what, but when files are removed from a module package, the module is probably updated by removing the originally installed directory and then extracting the tar of the new release. When that happens, one may forget to save/move the external editor package, that is required to be present by this module in the same module location.
So... it might be easier if the module could provide alternative locations to install external editor packages. Maybe somewhere in the files directory? Maybe in the modules directory with no real Drupal module in it? Maybe somewhere in the themes directory?
I wasn't sure if this is more a support request than a feature request. Suggestions to make the upgrade path easier?