I'm afraid i will jump out of the window the next moment ... I don't get this thing working :-(
What i found out in
http://www.ez.no/developer/ez_publish_3/forum/developer/pass_additional_information_to_cart is the possibility to bring back my $setCourseID variable in the template, but i don't get it working with the user/edit module.
If i am thinking correct, the /user/edit.php calls the /content/edit.php, and i want to take my variable from the <input type="hidden" name="setCourseID" ...> in my template file through the user/edit.php to content/edit.php and then use {$setCourseID} in my content/edit.tpl file to show my variable there.