script to set synaptics configuration for Thinkpad T440p

touchpadconf.sh

#!/bin/sh

# this script sets some parameters to get a useable configuration
# these changes are not persistent, you may want to include this in your autostart

# 1 finger = left click, 2 finger = right click, 3 finger = middle click 
synclient TapButton2=3
synclient TapButton3=2
synclient ClickFinger2=3
synclient ClickFinger3=2

# enable horizontal two-finger scrolling (vertical is enabled by default)
synclient HorizTwoFingerScroll=1

# disable the top edge of the touchpad to prevent jittering when using the trackpoint
synclient AreaTopEdge=2500

# configure trackpoint buttons
synclient RightButtonAreaLeft=3700
synclient RightButtonAreaRight=0
synclient RightButtonAreaTop=0
synclient RightButtonAreaBottom=2300
synclient MiddleButtonAreaLeft=2900
synclient MiddleButtonAreaRight=3500
synclient MiddleButtonAreaTop=0
synclient MiddleButtonAreaBottom=2300

I've been using

      Option "MiddleButtonAreaLeft"   "2900"
      Option "MiddleButtonAreaRight"  "3500"

over a year now. However, I've just experienced the out or range error for some reason, as mentioned by @bbraybrook . I can confirm that if I change the swap those two lines, the error goes away.