Hello Jean-Michel.
I found this thread while searching for a way to add City to the Enrolled users table when we view who is enrolled in a course.
We are using Moodle 2.7 currently. I looked at your great explanation about adding a user name to the Quiz report but the file did not seem to be the same to do what I would like to do.
If you have a time could you please point me in the right direction to add City to the Enrolled Users page.
Thank you for your time and help.
Dennis