I'm wondering if we can assign one LAN port to be converted as a USB port and connect a flash disk to the end point of the improvised usb port to be mounted as a web space.
Is this possible?
by the way i intend to apply this on my WAP54Gv3 and E2500 both loaded with DD-WRT firmwares if possible.
What? No! USB and Ethernet are two very different things, despite both using electricity and wires. This is why USB-to-LAN adapters are not just simple connectors you plug into your computer.
See http://en.wikipedia.org/wiki/Ethernet and http://en.wikipedia.org/wiki/USB for more information.