Mouse speed settings don't apply to gdm as well
On a normal single-user laptop the login screen ends up having the default mouse speed settings versus my session. This creates a bad user experience since the mouse speed suddenly changes considerably on logout/login. It would make sense to have that and maybe other settings (e.g., display scaling) readable outside just the user so that system wide parts of the system like gdm can have logic similar to "if X is the only interactive user of the system use his settings for mouse/keyboard/display/etc".