Haven't seen it yet, but I was going to help him add molex connectors to the original jamma harness so he could restore the cabinet if need be. I'm a big fan of using the j-pac, it's what I've got in my dynamo cabinet, but if there's a configuration that would just need ONE encoder rather than two, I mean, really, what's the difference between rewiring half or rewiring all, either way you're doing some wiring.
Oh... I don't know... Maybe so he can have joysticks, start buttons, and coin-ups for players 3 & 4?
No need to be a ---tallywhacker--- about it.