Isn't K2 shutter button electromechanical?
That is, unlike, say a Super-Program or P3, whose shutter button is actually an electronic switch.
K2 shutter button is electromechanical, i.e. it is physically engaged to spring, lever, cam etc within the body,
just like ME, ME Super, ES, ESII.
Those can fire with dial position in AUTO, but the actual speed is unwarranted.
The electronics is controlling the time-delay between first and second curtain, not actually move the curtains.
I think the manual said so, just to prevent the usage of unwarranted speed in automatic position.
Again, thanks