As for stocking Chain Pickerel I would agree with not a good idea. Pike are not a favored table fare, though they can be filleted and are quite yummy, not many anglers would target the fish for eating. I would fear this leading to a similar situation happening, when Wilhelm first opened.
For controlling the stupid shad, I think more Walleye, Sauger, Saugeye etc.
However, for now, leave well enough alone as Wilhelm has made a tremendous turn around regarding a family fun fishing lake. Butttttt that being said, I would like to see surveys taken, especially on the heavily laden pontoon boats, as to the quality and quantity of pan fish leaving the lake.