Quoted from Chet:
Unfortunately, the Extra ball in Video mode is controlled by the auto percentaging programmed into the game, so as you begin to collect more and more extra ball awards, the percentaging getting smaller and smaller till it goes away,during VM. If you do a game reset, etc., it will come back, but will eventually go away. I am runnning L-5 and it has the VM extra ball feature and shows up on both sides of the road I am pretty sure.
That's kool, I've never seen this before, not even when I played the crap outta of the pin when it was brand new . . .