Initial thoughts:
Consider adjusting the slingshots angle/force, because right now once the ball starts bouncing between them it basically always send it to the outlanes.
As the left orbit stands right now, the amount of force to get the ball to the lights is really tight between not making it and always going to the rightmost lane. You can either make the lights controllable so the player can rely on putting the unlit light on the right, or mess with the physics/shape to get more variation at the end of that orbit.
The diverter seems good (although I'm personally not a fan of them) and doesn't send the ball back down the table too frustratingly.
If you're gonna stick with JPSalas's physics, consider updating to the latest 3.0.1 code, as it has a couple more variables you can tweak to get your ball feeling just right. Also in there are a lot of useful starting points for material physics settings, and good explanations for what's what.
Haven't managed to get into any special modes, but I'll give it a try again when I have more time! So busy that my own projects are on hold, unfortunately 