It must cost a lot to install two tiller wheels. Why would anybody do it? For what reason? To make the FO feel good? The two recent clipping of wings in the US shows that with the captain taxiing things can go wrong, what if the new guy in the right seat is taxiing, what experience taxiing does he have and could he have done it better?
It does not. many aircraft have this provision, a simple handle is the installation.