Quoted from Quench:There is no way to disable Extra Ball as designed. It's going to require a ROM modification. You will need access to an EPROM programmer to go down this route.
Which means there's no way to disable it on Stern Pinball either, since it's the same rom. You want to tackle this one?
I guess no tournaments really use either title as this is the first time it's come up? Any other early mpu100 sterns that have this issue? (I already know about Dragonfist's)