Hi,
As far as I can tell the usb enabled router is a Telkom specific version - hence you'll need to use the hcom firmware if you want to keep the usb stuff working.
My original problem was that after I set up the ftp share, I could access the ftp site from the LAN but not the WAN. I know that ftp is not being blocked by the ISP 'cause when I create an internal ftp site and allow it as a forward through the firewall it works perfectly - so it seems like the firewall blocks direct access to its WAN interface (except for the LAN and its return connections).
I managed to figure out how to telnet into the router so I could go and check the firewall in detail, except the latest version of the firmware has a very crippled version of busybox. An app called foxconn is used to manage the firewall but it too has effectively been disabled, so I can't check anything.
I also had problems with bulk data transfer via samba. My router was hanging completely after a few minutes.
I don't mind using ftp but even filezilla's excellent client is not *that* friendly to a 6-year old ;-). I don't want the kids to have to xfer files - just use them online.
I'm toying with the idea of mailing Hcom to get them to release a later version firmware to fix the problem but I've basically given up on the router share idea - looking at putting down an iSCSI linux box.
Have fun!