Passing parameters to model constructor

Sorry, I know this has been covered before.  Some of the questions regarding this are quite old, and I wondered why this functionality hasn't been made available as standard?

It would be really useful to be able to pass arguments to a model's constructor, along the lines of:

PHP Code:

$this->load->model('some_model', $args); 


Then in the model have:

PHP Code:

public function __construct($args) {
} 


I know I could make my own initialization method and do:

PHP Code:

$this->load->model('some_model');
$this->some_model->init($args); 


However I have some arguments that are required for the whole model to work, and if I forget to call init() things will get somewhat messy.