Я думаю если ты вот это:
// Product information
define('PRODUCT_NAME', 'CS-Cart');
define('PRODUCT_VERSION', '4.3.4');
define('PRODUCT_STATUS', ''); 
$config['dir'] = array(
    'root' => DIR_ROOT,
    'functions' => DIR_ROOT . '/app/functions/',
    'lib' => DIR_ROOT . '/app/lib/',
    'addons' => DIR_ROOT . '/app/addons/',
    'design_frontend' => DIR_ROOT . '/design/themes/',
    'design_backend' => DIR_ROOT . '/design/backend/',
    'payments' => DIR_ROOT . '/app/payments/',
    'schemas' => DIR_ROOT . '/app/schemas/',
    'themes_repository' => DIR_ROOT . '/var/themes_repository/',
    'database' => DIR_ROOT . '/var/database/',
    'var' => DIR_ROOT . '/var/',
    'upgrade' => DIR_ROOT . '/var/upgrade/',
    'cache_templates' => DIR_ROOT . '/var/cache/templates/',
    'cache_registry' => DIR_ROOT . '/var/cache/registry/',
    'files' => DIR_ROOT . '/var/files/',
    'cache_misc' => DIR_ROOT . '/var/cache/misc/',
    'cache_static' => DIR_ROOT . '/var/cache/static/',
    'layouts' => DIR_ROOT . '/var/layouts/',
    'snapshots' => DIR_ROOT . '/var/snapshots/',
    'lang_packs' => DIR_ROOT . '/var/langs/',
    'certificates' => DIR_ROOT . '/var/certificates/',
    'store_import' => DIR_ROOT . '/var/store_import/',
    'backups' => DIR_ROOT . '/var/backups/',
); 
Поменяешь уже будет отлично 

 Просто думаю с твоей идеей вобще сурогат знатный получится 
