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[eluser]tomcode[/eluser]
I'd do :

1. config/routes.php

Code:

$route['default_controller'] = "welcome";
$route['scaffolding_trigger'] = "";
$route['(:any)'] = "welcome/$1";

2. controllers/welcome.php

Code:

function Welcome()
{
    parent::Controller();
}

function _remap($user)
{
    if($user == 'index')
    {
        $this->load->view('welcome');
    }
    else
    {
       // user related stuff
    }
}