Facebooker talk - Oct 2008 - Creating infinite sessions

I want to use infinite sessions in my application.  Right now I have
the following in my controller:

protected
  def update_session_key
    secure_with_facebook_params!
    if facebook_session.infinite?
      # Store the session key in the DB
    end
  end

and I ask for the permission with the fbml tags.  I then call
update_session_key on every request, in case they decided to give me
permission.  Is there a better way of going about this? I am
particularly concerned by the use of secure_with_facebook_params!
which seems kind of hacky.