Re: How can add new fileds to Assignment Submission status form

You have to change the text that is sent to the submission receipt through language customization from the GUI of moodle.

You can visit "SIte Administration" -> "Language" -> "Language customization" and then filter the mod_assign component. The strings you may want is 'submissionreceipthtml', 'submissionreceiptsmall', 'submissionreceipttext'.

There you can edit the text and add more info to it using the placeholder '{a}'.

So, if you want idnumber you can print it with  {$a->idnumber}, if you want users email you can print it with {$a->email}.

Of course, you have to check first the function send_assignment_notification in /mod/assign/locallib.php. You may have to add the above variables to info Class.