There is no hook_access. I just tried to write a hook_access which simply return TRUE on all the case, still its not working.
 

function questions_import_perm() {
  return array('import_questions');
}
 

http://cvs.drupal.org/viewvc.py/drupal/contributions/modules/quiz/includes/questions_import/?pathrev=DRUPAL-6--4

This code has no questions node preview or node_preview call. It is written very badly, i am trying to refactor and add preview option to it. I just checking whether node_preview trick will work here or not.

this is the code which return "access denied page" http://drupalbin.com/10641 around line no 31