a part of /etc/X11/xorg.conf.d/50-mtrack.conf (and add "xset m 40/10" to your .xprofile)

50-mtrack.conf

Section "InputClass"
        Identifier "touchpad catchall"
        Driver "mtrack"
        MatchIsTouchpad "on"
EndSection

Section "InputClass"
# available options: https://github.com/BlueDragonX/xf86-input-mtrack
	Identifier "Multitouch driver settings"
	MatchProduct "Apple|bcm5974"
        MatchDriver "mtrack"
        Option "Sensitivity" "0.25" # between 0 to 1
        Option "IgnoreThumb" "true"
        Option "IgnorePalm" "true"
        Option "FingerHigh" "7"
        Option "FingerLow" "7"
        Option "ClickTime" "70"
        Option "TapButton1" "1" # 1 finger tap
        Option "TapButton2" "3" # 2 finger tap
        Option "TapButton3" "0" # 3 finger tap
        Option "ClickFinger1" "3" # 2 finger click
        Option "ClickFinger2" "2" # 3 finger click
        Option "ScrollUpButton" "5" # 2 finger swipe up to scroll down
        Option "ScrollDownButton" "4" # 2 finger swipe down to scroll up
        Option "ScrollLeftButton" "7" # 2 finger swipe left to scroll right
        Option "ScrollRightButton" "6" # 2 finger swipe right to scroll left
        Option "SwipeDistance" "1400"
        Option "SwipeUpButton" "0" # disable back button
        Option "SwipeDownButton" "0" # disable next button
        Option "SwipeLeftButton" "9" # next
        Option "SwipeRightButton" "8" # back
        # Option "Swipe4Distance" "1400"
        # Option "Swipe4LeftButton" "9" # next
        # Option "Swipe4RightButton" "8" # back
        Option "TapDragWait" "30" # msec
EndSection