I'm guessing "kustom Kid" was playing around (tilt/key column). A repop dash would have an Ignition hole.
Yes, it allows for hand throttle from inside for lots of reasons we would never use. PTO, 4X4, uphill from a stop...for jitter foot Harry, etc.
I would not bother with a hand throttle. Put a fake knob, use it for something else, map light/charger/security start switch or fill with a delete plug.
