Thanks Darko!
Your code example works here too.
This should give me a hint for putting that to work right.
Will publish the change later on...
YJ.
Figured it out...
in course/editsection_form.php, comment out line 91
if (strval($default_values->name) === '') {
// $default_values->name = false; // custom checkbox needs to be CHECKED in order to encourage user to fill-in a proper name
}