@chmelab: Try xinput set-prop "AlpsPS/2 ALPS DualPoint Stick" "Evdev
Wheel Emulation Inertia" 40

@blask: Don't have that problem, settled on value 4.

Here's my .xsessionrc, works fine for me, mid-button scrolling is mid-
paced, pointer is quick but not overtly so...

#!/bin/bash

# Set up mid-button scrolling
xinput set-prop "ImPS/2 Generic Wheel Mouse" "Evdev Wheel Emulation" 1
xinput set-prop "ImPS/2 Generic Wheel Mouse" "Evdev Wheel Emulation Button" 2
xinput set-prop "ImPS/2 Generic Wheel Mouse" "Evdev Wheel Emulation Timeout" 20

# Decrease TrackPoint speed
xinput set-prop "AlpsPS/2 ALPS DualPoint Stick" "Device Accel Constant 
Deceleration" 4
xinput set-prop "AlpsPS/2 ALPS DualPoint Stick" "Device Accel Adaptive 
Deceleration" 40
xinput set-prop "AlpsPS/2 ALPS DualPoint Stick" "Device Accel Velocity Scaling" 
1
xinput set-prop "AlpsPS/2 ALPS DualPoint Stick" "Evdev Wheel Emulation Inertia" 
40

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https://bugs.launchpad.net/bugs/1590590

Title:
  Touchpad not recognized on Dell Latitude E7470 Ultrabook

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