You should be able to add 0.0.0.0/0.0.0.0 to the Remote Access section which should allow all addresses into the ACLs that apache sets up on the web apps. If that doesn't work just edit the file you need to change in /etc/e-smith/templates/etc/httpd/conf/httpd.conf/ to reflect the ACL you require and anytime the templates get expanded your change will remain intact.
Adding a local network of 0.0.0.0 / 0.0.0.0 pointing [presumably to] the box's existing default route would just create a duplicate default route.