feature: Add option for disabling pointer acceleration

[yzhou216]

Starting from macOS Sonoma, the default pointer acceleration can be disabled by setting

$ defaults write NSGlobalDomain com.apple.mouse.linear -bool "true"

It would be great if nix-darwin can provide an option like

system.defaults.NSGlobalDomain."com.apple.mouse.linear"

It can also be set or disabled in the GUI by "System Settings > Mouse > Advanced > Pointer acceleration".

[yzhou216]

I just found out about this issue that was opened a while ago: #788

Pointer acceleration indeed can be disabled by setting system.defaults.".GlobalPreferences"."com.apple.mouse.scaling" to -1.0. However, this was an old hack before Sonoma was released, plus the mouse would become so slow which defeats the purpose.

I found this discussions on Apple Support Community from 2021 which explains the problem pretty well.

[Samasaur1]

You should be able to do either

system.defaults.CustomSystemPreferences.NSGlobalDomain."com.apple.mouse.linear" = true;

or

system.defaults.CustomUserPreferences.NSGlobalDomain."com.apple.mouse.linear" = true;

(I can never remember which one is the right one to use)

[yzhou216]

Problem solved!! Thank you :)
Closing this issue.

[yzhou216]

#1037 makes this built-in and also completes #788. I'm reopening this.