For Counter, Slider and RangeSlider, dragging with the mouse or pressing the arrow keys increase/decrease "the control's value by the current step".
Is it possible to have fine control, with step 1, when a key is held, e.g. Ctrl, both for dragging and pressing arrow keys?
Various applications use this convention for fine movement, e.g. to move objects without snapping to a grid when Ctrl is pressed in drawing applications.