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Option "VertScrollDelta" "integer" The amount of motion considered one unit of scrolling vertically. Default: "1". Property: "Evdev Scrolling Distance".
Option "HorizScrollDelta" "integer" The amount of motion considered one unit of scrolling horizontally. Default: "1". Property: "Evdev Scrolling Distance".
Option "DialDelta" "integer" The amount of motion considered one unit of turning the dial. Default: "1". Property: "Evdev Scrolling Distance".