I checked that out, and it seems like that USB port is used more for management rather than as a network access point. This looks as if it is similar to the serial port on other routers, which allow for management/access, but wont allow for a "true" connection for network traffic. It does state that you can connect a PC to it, and it will allow for network traffic through it, but it may require the use of drivers to be installed on the PC for proper use (and the modem wont have any idea what it is trying to do). Might want to email Linksys to see if that is a real option.
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Regards,
clutch