@bmeeks:
You could safely disable that rule if you wish.
Bear in mind that if you decide to allow HTTP traffic on 443, all the rules with $HTTP_PORTS wont be inspecting that traffic. Unless you add 443 to the $HTTP_PORTS variable, which will cause other false positive with some HTTPS inspection. In other word, the way alot of rules are made, HTTP, non encrypted traffic, shouldnt be on 443
F.