Just added the latest Diary v3.4.1 to this site. This version will prevent users from trying to change the hidden, time created, when editing an entry with edit dates not enabled. It will automatically enter details of the attempt into the Feedback area with the admin account listed as the teacher. It also enters the attempt into the Moodle log.
This should be a fix for both Issue #9 and Issue #14, but I do have one or two more things to "check/test" before I make an official release.