Where did you find those settings for "APT::Periodic"? I've never heard of them, and my searches turned up dry. Are you expecting that setting those will cause apt-get or aptitude to automatically download new packages? I don't think that's the case; something has to actually execute the commands to download--apt isn't a daemon.
For authentication, a better solution would be to add the keys to apt's keyring; by working around it you're throwing out the security it offers. For the default release, well, I don't know about "APT::Default-Release", but I know that pinning in /etc/apt/preferences works. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]