Don't quite understand the question, but i have my xbox wireless gaming reciever plugged into it so i can use my xbox wireless headset in windows.
The ports basically function like a normal powered usb hub powered from the monitors power source.
If you are talking about getting sound from the PS3 through the monitor and out the usb headphones im not so sure, i'm guessing that it wont work as the monitor would have to have headphone drivers installed on it which i dont think it has. I am assuming that you want to get the sound from the hdmi out the headphones. Does the ps3 not have a usb port?
Interesting question though, especially if Benq do a speaker bar attachment!