The driver is a very nice Christmas gift, thank you, guys.

These settings make the Dell stick somehow Thinkpad feel:
# https://www.x.org/wiki/Development/Documentation/PointerAcceleration/
xinput --set-prop "AlpsPS/2 ALPS DualPoint Stick" "Device Accel Profile" 2
xinput --set-prop "AlpsPS/2 ALPS DualPoint Stick" "Device Accel Velocity 
Scaling" 3
xinput --set-prop "AlpsPS/2 ALPS DualPoint Stick" "Device Accel Constant 
Deceleration" 7
xinput --set-prop "AlpsPS/2 ALPS DualPoint Stick" "Device Accel Adaptive 
Deceleration" 7

You can play with these values and if we agree on some values, they
should be set by default, because the default setting makes the stick
really unusable.

Also, I didn't find how to slow down the mid-button scrolling speed :(

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

Title:
  Touchpad not recognized on Dell Latitude E7470 Ultrabook

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