First, Install 'Setting' by recipe.php , and set CakePlugin::load('Setting', array('bootstrap' => true));

Second, Create schema.

./lib/Cake/Console/cake schema create settings --plugin Setting

Configure Setting.settings like Model::validate.

Configure::write('Setting.settings', array(
                                           'tax_rate' => array('rule' => array('numeric')),
                                           ));

Setting::setSetting([key], [value]) or Setting::setSetting(array([key1] => [value1], [key2] => [value2]))

Setting::getSetting([key]) or Setting::getSetting()

See SystemControlTest.php.

the MIT License