Not a single distro I have used have had working touchpad tapping when the computer has loaded GDM login screen and I have had to click on the button to choose user and then login. After that I have logged in the touchpad tapping works but not before. However, in Solus tapping works straight away even in GDM. How have you managed to do this when no other distro have? I think this is one of very many small things that Linux distros miss, configure wrong or are just weird and trigger an OCD attack.