I know this was said to be acknowledged and on the to do list, but I think they forgot about it. I recently emailed Western Digital about this problem as I really need this support as well. This is what I said:
"Hi and thanks for a great product. I do have one concern. I cannot get my WDTV Live media player to recognize both drives in my BlacX Duet docking station which I bought specifically to use with the media player. It will only randomly see one drive or the other, but not both. And I know I am not the only person using the Duet with your product, it is becoming increasingly popular. However the only solution I can find online is to use a hacked firmware which has drivers that support this device. I do not want to use a hacked firmware. I hope that you can work with Thermaltake to resolve this issue."
And this was their response.
"I apologize for your inconvenience. At the moment, WD only provides support when the drive's are physically plugged into your unit without the aid of any devices."
B-Rad's WDLXTV enhanced firmware has drivers that make it work. I don't see why WD can't add this. It seems as though it would be pretty simple. However, they did also tell me in the email that they review these forums too see what features are requested the most, so does anyone else out there want to see USB hub support?