How can or can you edit the the remote screen for the device you trying to operate with the Vizio tablet. Have a Sony receiver and the tablet works everything but the input button
I don't think you can edit it per se. I too have a Sony and the same issue but can get around it by using the menu button and them selecting the input from the xmb.
It has been rumored that a future release could have learning functionality. With our luck it will be a feature of the 10" tablet if/when it is released.