As said by others...
A 'traditional' choke only works on a carby petrol engine and "chokes" the air flow across a range of throttle openings enriching fuel/air mix. Ergo you cannot traditionally mechanical choke a fuel injected engine petrol or diesel.
A hand throttle does a different job as it adjusts the throttle input IE it's exactly the same as the foot throttle input and opens the throttle without changing or 'correcting' the engine fuel air ratio.
As per the manuals, it is a hand throttle or idle control for use as the operator see's fit. Largely disappeared these days but they were vital for any PTO application and still goddam handy for low range or rough terrain work.
There has been probably 100's of fatalities over the years because of hand throttles. Mainly farm related accidents were someone goes under the vehicle or tractor while feeding the stock or whatever after setting the throttle and jumping out of the seat to scatter feed from a tray or trailer.
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