Multiple Code Igniter Config Folders

[eluser]takasia[/eluser]
Question - is it possible to load the application config like this form the default config file?
I tried and it didn't worked, but maybe there is some way...

equire_once CONFIGPATH.'config'.EXT;

This I have in my index.php:

$this_app_config_folder = "the_path";

// after define('BASEPATH', str_replace("\\", "/", $system_path));
define('CONFIGPATH', str_replace("\\", "/", $this_app_config_folder));

But it seems that the CONFIGPATH just doesn't get defined - I can echo a BASEPATH etc from the default config.php but CONFIGPATH is just empty.