Yeah, confining games of 3 buttons to 2-buttons panels (or of 4 to 3-) was quite usual here in this land of ours. Until the coming of Japanese cabs anyway, control panels were so badly designed, mounted components of such a low quality or had them in a such a poor state that many times it just didn't even matter. The joystick version(s) of Cabal is, at best, an afterthought, though. It was never designed to be played with anything else than a trackball and in Japan it was always like this. Good luck if you lived in Europe, yep.