SamyGO

Actually yes... It could be done. I don`t remember which version of telnet enabler do you use, but you can add this mount feature to telnet enabler`s script. If here isn`t any script, then use another as basis for your modification (e.g. http://sourceforge.net/projects/samygo/ ... p/download )
Edit telnet.sh using N++ or Akelpad, add your code, copy to TV and enjoy.

I think you need also mountpoint on virtual usb (or on physical USB) if you need to watch movies from NFS shares.