It's not a bug...
I had the same question. As the SME box has already an Apache/httpd server, you need to configure this server via the template-custom system of the httpd.conf to forward all the adresses you want for the http.
I.e.: if you want
http://www2.mydomain.com to point to a local machine
or
http://www.mydomain.com/serveur2/ or both, or more.
To know how to do it, simply search in the apache docs.
You can trigger port but it will works only from the outside of the LAN: trigger port public IP 8080 (on ethernet card 0) to IPlocalmachine 80 (on ethernet card 1) =>
http://www.mydomain.com:8080/bonjour.htm will only works from the outside. Inside not working because you are working only on the eth card 1 !
For other protocols, you need to trigger port, or destroy the architecture of the sme if it is already working a deamon for this protocol.
Jean-Philippe