That's getting to be a wild paint job! Looks good.
Yeah, ask about the cruise control. There's probably support for it in the ECM, it just wasn't fully set up. To fully enable ECM-based cruise control you'd also have to add two switches (set/accel and resume/decel, I think). That would entail finding the ECM (bolted to the engine block below the intake, around/behind the injection pump), figure out which two wires on its connectors are the cruise input wires, and get them connected to new switches on the dash. I don't remember whether INSITE tells which pins the cruise switches need to be on, or maybe it even allows the user to select two available pins for it. You could probably get just the right switch to fit your dash from a Thomas parts place.