//mark shipping enabled always
add_action('wcfmmp_settings_fields_shipping', function($fields) {
if(isset($fields['wcfmmp_shipping_enable'])) {
$fields['wcfmmp_shipping_enable']['dfvalue'] = 'yes';
$fields['wcfmmp_shipping_enable']['attributes'] = array( 'readonly' => 'readonly', 'disabled' => 'disabled' );
}
return $fields;
});