Hi DavidR,
Going that way is not for the average Internet user, if you are an advanced user and have some advanced programs to check on the integrity of your system all the time, and know what that means, well some do. I know the function of a firewall has been downgraded by some 40%, and there is a lot now that can get unto your machine under the radar right into your machine, that is why you need webshield and port 80 scanning with a form of IDS installed. Then it would be good that firewalls could also incorporate some form of extended protocol scanning with a personal configuration where you could block all you do not want to admit or block from going out even at the lowest levels.
To-day multi-level protection is the best thing we have at the moment,
polonus