My Logitech TrackMan Marble configuration

I use the "Logitech TrackMan Marble" trackball with Linux and X11. I use a custom configuration, so I can scroll with the trackball when the left small mouse button is pressed.

If you want to use this configuration too, create the file `/usr/share/X11/xorg.conf.d/50-marblemouse.conf` with this content:

Section "InputClass"
    Identifier      "Marble Mouse"
    MatchProduct    "Logitech USB Trackball"
    Driver          "libinput"
    Option          "ScrollMethod" "button"
    Option          "ScrollButton" "8"
EndSection

There is a German language wiki page for configuring this trackball, which helped me a lot: