[Jawelin]

As I couldn't manage to make this hack working 'as is', I created a workaround to obtain the same results.
Here they are, if - as read - someone else got the same problems.

Add

PHP Code:

  //HACK: Return to edit page after saving template
  makeyesnocode("Return here","comeback",1);
  makehiddencode("prevaction", "$action");
  //HACK: Return to edit page after saving template 


wherever you want to return to (I mean, right before the 'save changes' button in edit section)...
Later, in the 'doupdate' section, add at the end:

PHP Code:

  //HACK: Return to edit page after saving template
  if ($comeback and $prevaction) {
      cpredirect("template.php?s=$session[sessionhash]&action=$prevaction&templateid=$templateid",0);
  }
  //HACK: Return to edit page after saving template 


It should work...
Thanks to Chen for the idea.