Depends on D28310
We can make it slower with a number between 0 and 1.
By those KCM, I meant their frontend (they have each 1 for X and 1 for Wayland).
mouse kcm for X is in main_deviceless.qml
touchpad kcm for X is in touchpadconfigxlib.cpp
And this feature can only be implemented for Wayland.