Logitech MX Master 3 - horizontal scroll as buttons - sensitivity reduction on Linux (xbindkeys & external script)

.xbindkeysrc

## Scrollwheel left
"~/.xbindkeys/MX-Master-3-bindings.sh Scroll_L"
  b:7 + release

## Scrollwheel right
"~/.xbindkeys/MX-Master-3-bindings.sh Scroll_R"
  b:6 + release

MX-Master-3-bindings.sh

#!/usr/bin/env bash

button=$1

# Horizontal scroll sensitivity reduction
hScrollModulo=3
hScrollIndexBuffer="/dev/shm/LogitechMXMaster3HScroll"

function temporizeHorizontalScroll {

  local newDirection=$@;

  # read buffer
  local buffer=(`cat $hScrollIndexBuffer`)
  local oldDirection=${buffer[0]}
  local value=${buffer[1]}

  if [ "$oldDirection" = "$newDirection" ]; then
    # increment
    ((value++))
    ((value%=$hScrollModulo))
  else
    # reset on direction change
    value=1
  fi

  # write buffer
  echo "$newDirection $value" > $hScrollIndexBuffer || value=0

  # temporize scroll
  [ ${value} -ne 0 ] && exit;
}


case "$button" in

  "Scroll_L")
    temporizeHorizontalScroll "L"
    xdotool key --clearmodifiers ctrl+shift+Tab; ;; # Previous tab
    ;;

  "Scroll_R")
    temporizeHorizontalScroll "R"
    xdotool key --clearmodifiers ctrl+Tab; ;; # Next tab
    ;;

  # ...

esac

@jmarcet That's just a small temporary file. You can create it yourself it it already exists. If you don't have a /dev/shm/, you can alternatively store the file below /tmp/. In my own version of the script, I am creating the file if it doesn't already exist.

@Sebelino Yeah, my bad, I had an error in the script and for a moment I thought it was something like the synaptics driver has.

Anyhow, once I saw it working I don't see any benefit from it, you can get the same kind of delay directly with xdotool like xdotool key --delay 100 Control_L+Tab. I don't see any difference either by adding release to the button event.

I'm still looking for a way to get the TOP button as a modifier which I can then mix with the thumb wheel, and only do the Ctrl+Tab if pressed together.

@jmarcet By TOP, do you mean the Smart Shift button? One way is to create a couple of new rules in Solaar: one for pressing the button, one for releasing it. If pressed, a 1 is written to a different file below /dev/shm/. If released, a 0 is written. Then adjust the script in this gist so it reads this file and executes xdotool conditionally based on the file contents.

@Sebelino Thanks, I'll try it out.

@Sebelino At the moment I've settled with this and it's working beautifully: