Currently mouse settings support "pointer acceleration" and "pointer threshold". This dialogue should have tick "enable acceleartion" and "pointer speed" slider. Acceleartion may toggled via libinput Flat profile
The Input KCM currently doesn't support libinput at all, so this is a duplicate of the bug tracking that. Once support makes it in, we should have those settings. *** This bug has been marked as a duplicate of bug 383379 ***
*** This bug has been marked as a duplicate of bug 350688 ***