Is there a way to deactivate the FEC page from the admin without having to delete or rename checkout.php? I tried adding this to the database:

INSERT INTO `configuration` VALUES (NULL, 'Enable Fast & Easy Checkout Page', 'ENABLE_FEC_ONE_PAGE_CHECKOUT', 'true', 'Default = true.', 54, 10, NULL, '2008-03-29 13:55:00', NULL, 'zen_cfg_select_option(array(''true'', ''false''), ');

and changing checkout.php to this:

if (ENABLE_FEC_ONE_PAGE_CHECKOUT == 'false') {
//DO NOT EDIT THIS SECTION
define('FILENAME_CHECKOUT', 'checkout'); //rmh referrals
define('FILENAME_CHECKOUT_SHIPPING', 'checkout');
define('FILENAME_CHECKOUT_PAYMENT', 'checkout');
define('FILENAME_FEC_CONFIRMATION', 'fec_confirmation');
}

but unfortunately it does not work. Anybody has any ideas. The mod works perfect by the way.