Custom certificate (plugin)

After much searching, I found these default parameters being set in mod/certificate/mod_form.php. Specifically in the following lines:

$mform->addElement('select', 'savecert', get_string('savecertificate', 'certificate'), $ynoptions);
$mform->setDefault('savecert', 1);
$mform->setHelpButton('savecert', array('save', get_string('savecertificate', 'certificate'), 'certificate'));


Where the setDefault('savecert', 1) was originally set to 0. Setting it to 1 has done the trick.