You can install a switch in the speed input line
I did this onthe Murano essentially the same system. When the switch is in the open position the inputs all stay as if the vehicle is not moving. Download the service manual to ocate the correct wire.
Thanks great harware hack
I am studying the wiring diagrams to see where that wire come from it maybe possible to opent that ciruit without all the dash disassembley when I did it on My Murano I was able to do it under the dash laying on my back and not taking anything apart.