Parameter to set the speed of the slow down when pressing |shift|?

I wonder if there is a way to change this parameter in preferences?
is there an operator for this?
and if not is it possible to have this setting?
It will be interesting to slow down move when near a snaping point

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it’s superfluous … you already have 3 speed …
scolling the numbers or the slider scroll in multiples of 100
with ctrl scroll in multiples of 1000
with shift scroll in multiples of 10 …
if you do something more precise at that point, click and write the number.