"Don't Remember Me" Login

[eluser]Prophet[/eluser]
I was playing around extending the session class today and I can't for the life of me work out how to specify the sess_expiration value per session. I am able to change the value using $this->session->sess_expiration = .. value (confirmed by logging sess_expiration value in _set_cookie()) but the sessions still last for the time specified in the config file.

I did a bit of searching and found some useful threads so I'll look into it more tomorrow. Thanks for the advice guys.