Just curious. Does American allow pilots to "cross tune" radios? For those who may not know what I mean, I am talking about the modern style radio control panel that can be used to control any radio. In the planes that have that style of radio is the right seater permitted to control VHF L frequency from their side?

At UAL it's standard practice on the Airbus, but on the 777 some old time captain's don't allow it and require that the VHF R control panel always be tuned to VHF R only.

Anyways, just wondering?