I think the description for this could be discussed a bit, I have the following in mind:

"The "Default" profile lets the mouse select its own acceleration profile, "Flat" is a constant factor, and "Adaptive" changes the acceleration depending on the current mouse movement."

I'm still fairly unconvinced this is Settings material. I don't think this is relevant for most people. Acceleration profiles are hard to explain, and we're probably just going to make people confused. Some more adventurous might try these options to see the results. I feel like this is Tweaks material, not Settings.

Actually, it has come to my attention that this is already available in Tweaks:

Given that myself and members of the design team share the opinion that this is not a good fit for Settings, I think this is 3. Out of Scope for now. @felipeborges do you have objections to closing this MR?

A use case to consider: Family member with Parkinson's occasionally use my computer. I prefer the Default Acceleration but this is not desirable if you have hand tremors(1). I end up changing this setting in the Tweak tool more often than I change anything in the Settings tool.

(1) Ideally a custom acceleration profile to attenuate at tremor frequency would be the best but a flat profile also helps a lot.

A use case to consider: Family member with Parkinson's occasionally use my computer. I prefer the Default Acceleration but this is not desirable if you have hand tremors(1). I end up changing this setting in the Tweak tool more often than I change anything in the Settings tool.

If it's advertised as a accessibility setting, it should probably go in the accessibility panel, along with other "pointing & clicking" settings.

If the goal is to have it as a general purpose setting, it would be useful to answer Allan's question about why someone might use one profile over the other, especially when apps can already request raw movement information in situations where they would want to control the pointer.

While I would absolutely love to have mouse acceleration options added into settings, this isn't the way of getting that done.

Please be respectful. While you may not agree with him in this particular topic, he has done a ton of work for the betterment of the Gnome project.