Add a new function to add to request methods (POST, GET etc)

Hi,
I'm not sure if the functionality for this already exists as I haven't been able to find any documentation for this in the CI docs. Basically we should be able to add to a GET or POST request vars manually using a method like

PHP Code:

$this->request->setPost('key' => 'value'); 


Currently if you need to add something to a request inside a controller, then you set it like so

PHP Code:

$_POST['key'] = 'value'; 


And then if you try to use

PHP Code:

$this-request->getPost(); 


the newly added key - value pair doesn't appear in that method.