...I'm building a driver cabinet and will have no joystick to select ok to this error.
Wrong. The wheel is a joystick (unless you're doing a 360 wheel), and will do fine by default (unless the wheel is joystick 2+). Or you can map UI_Left and UI_Right to any buttons, pedals, gear shift, ect you have. One start button and one turbo button will do fine.
The cab that you can't "OK" with would need:
no player start buttons,
no action buttons,
no pedals,
no joystick,
no 270 wheel,
no lightgun,
only trackball or spinner controller, and
only one "coin" button.
How many games are like that? Zero driving games? So why build a cab like that?
Well damn... I didn't realize I would need to explain in such detail.
It's a driving cabinet with a single player button, 1 coin button, 1 quit button, 1 turbo button, 2 pedals and a 360 wheel. I realize I could configure 2 of the buttons to be mapped to O and K. That would definetly work. What wouldn't work well is explaining that to my 4 year old neice or 5 year old nephew. My buddy compiled me a version of mame without the need for OK. It took me an hour or so to get the version of mame I needed and I bet it saves me 5 hours explaining to various people that to press OK you hit this button and than that button.
The OK message that is the real culprit is the "Video is not 100% accurate". Since it comes up everytime and for a large portion of the driving games.
As it is, about 30 games will work well with the configuration I've listed. I didn't see the harm in asking if anyone had a copy of it before I seeked other means to obtain it.