Back in 2003 ntl used to do a 'console' service which enabled both the USB and the Ethernet sockets with seperate IP addresses
http://pressoffice.virginmedia.com/p...4642&highlight=
Didn't last long though once PCs started getting Ethernet sockets and routers became a lot cheaper along with the speeds of the broadband going faster than the USB sockets would allow.
I also doubt the newest modems have the ability built into them