No, PC's have had multi-button games for a looooong time, but maybe not as far back as I am thinking. But wait... yeah, pretty much Gravis and Logitech, I remember having 2 buttons and that scenario was even standard on systems as far back as the Apple ]['s.
In any event, by the time the A500, CDTV, A1200 & CD32 came out, 2+ buttons for gaming should have been the standard. I'm just surprised that it wasn't the standard starting with the A1000.
when using anologue joypad i have four buttons (gravis anologue pro). when using digital joystick (modifyed) i have two fire buttons.