Sway inputs

# it has a big output
swaymsg -t get_inputs | less

Disable mouse acceleration in Nix

Use wayland.windowManager.sway.config.input."type:pointer".accel_profile.

{
  input = {
    "type:pointer" = {
      accel_profile = "flat";
      pointer_accel = "-0.5";
    };
  };
}