Sanwa RX-471D Dual ID Receiver - Gimmick or usable?

[Hairy Spider]

Hi All,

Just wondering if anyone out there has tried using the Dual ID capability of the Sanwa RX-471D receiver? i.e One car bound to 2 different handsets where in my case one would be wheel with the other sticks. Is it possible for 2 drivers swap cars by changing the selected model in their handsets? I'd like to be able to swap cars with my son during practice without the hinderance having to use a wheel tx...

Cheers,
Jon.