In the rig demo video, you enable selection and visibility for all of the different ball types, then you can just select the rig and all the balls together with a box select and duplicate it.
I can't get that to work in 2.8. When I enable visibility and selectability in the UI, on the active ball type from the rig UI is shown and selectable.
Then when I duplicate what I do have, it creates the new ball object in the same collection as the original, breaking the drivers for both rigs.
Help please.