drupal 7 hook_form_alter
function hook_form_alter(&$form, &$form_state, $form_id) {
if (isset($form['type']) && $form['type']['#value'] . '_node_settings' == $form_id) {
$form['workflow']['upload_' . $form['type']['#value']] = array(
'#type' => 'radios',
'#title' => t('Attachments'),
'#default_value' => variable_get('upload_' . $form['type']['#value'], 1),
'#options' => array(
t('Disabled'),
t('Enabled'),
),
);
}
}