This does not require CLI. https://help.gnome.org/users/gnome-help/stable/mouse-sensiti...
GNOME tweak tool has even more options, also from a GUI: https://wiki.gnome.org/Apps/Tweaks
GNOME tweak tool has even more options, also from a GUI: https://wiki.gnome.org/Apps/Tweaks
Perhaps they'd not know of gnome tweaks, though they could remember Power Tools from Windows....
Mouse acceleration is annoying (bordering on infuriating, imo) because it changes cursor movement from an easy 1:1 mapping of mouse movement->cursor movement by adding an additional dimension. You then not only have to keep in mind how far you're moving your mouse, but also how quickly you're moving it. I can't fathom why UI designers seem to think that it's so great that it should be present with no ability to disable it.