Enable file traversal type autoloading

[eluser]richzilla[/eluser]
In other php frameworks (kohana, zend, fuel) its possible to auto load files based on their directory path. Is it possible to do this in codeigniter, so i could for instance load models, by typing something like

Code:

models_category_users

(where this would map to models/category/users.php) ? any help would be appreciated.