GSettings configuration tool can do the jobs via 2 commands, though the gdm user privilege is required.
1. Get gdm user privilege in a terminal window.
1. Open terminal by either pressing Ctrl+Alt+T or searching for ‘Terminal’ from software launcher.
2. Run command to get root privilege (type your password when it prompts):
3. In the terminal, run command to allow gdm to make connections to the X server:
4. Finally switch to user gdm in this terminal via command:
su gdm -s /bin/bash
2. In this terminal, run command to enable numlock automatically in login screen:
gsettings set org.gnome.settings-daemon.peripherals.keyboard numlock-state 'on'
3. To enable tap to click, run command in the same terminal:
gsettings set org.gnome.desktop.peripherals.touchpad tap-to-click true
That’s it. Enjoy!