Clicking the Die button adds uniformly distributed random deviations in the range of [0,1] multiplied by the range of the VCS widget (plus any offset).
If you hold down the Shift key when pressing the Die button (or holding down the 'r' key), the random deviation is 25% of the specified range of the widget.
We don't currently have a spot where you can change that smaller percentage deviation. Perhaps it could be added as a Kyma Preference.