If you would like to dynamically set a config item or change an existing one, you can so using:
$this->config->set_item('item_name', 'item_value');
Where item_name is the $config array index you want to change, and item_value is its value.
So in that one controller, you just set whatever item_name it is, to false... At least, that should work... If it doesn't, it should be made so it would work :p
[eluser]Pascal Kriete[/eluser]
It does not work, because the data is cleaned in the input library constructor. The input library is instantiated before the controller, so it's too late by that point.