Code review comment for lp:~andreas-pokorny/mir/add-option-to-disable-acceleration

Yes, the user will always observe instantaneous acceleration when velocity changes from zero to non-zero. However pointer acceleration is not about that first event, it's about the second and subsequent events. In the second and subsequent motion events your acceleration is precisely zero if your velocity is constant/flat. So a constant velocity or flat mode should not have "acceleration" in its name.

That all said, a constant velocity multiplier of anything other that one is arguably useless. Less than one and a lot of code will never move the cursor. More than one and you lose pixel accuracy on screen. I guess that's why the libinput code limits the multiplier for flat mode to 2.