So if I understand it correctly, this Clark feature simulates the coaxial machine gun (as opposed to the bow machine gun). In normal mode, only Clark boards pick up and respond to this machine gun by emitting bullet strike sounds, but it is switchable to allow it to transmit the two-shot-kill mode?

In my experience battling both indoors and outdoors, you can't hear the bullets striking your target tank because you would probably be too far away. And if you are close enough, you don't need your coaxial machine gun to sight you in either.

I do not think banning the Clark board is necessary though. Anytime a Tamiya tank gets killed quicker than its hit capacity allows, and there are Clark tanks on the field, it would be dead easy to root out which tank was the culprit and have it taken off the field.