No way to set libinput option "ClickMethod" "clickfinger" for Trackpad

The trackpad setting GUI currently offers no way to set the libinput option "ClickMethod" to "clickfinger" for a trackpad, nor the tapping button map. This can be worked around by setting up a preference file e.g. /etc/X11/xorg.conf.d/30-touchpad.conf with contents like

Section "InputClass"
	Identifier "touchpad"
	Driver "libinput"
	MatchIsTouchpad "on"
	Option "ClickMethod" "clickfinger"
	Option "Tapping" "on"
	Option "TappingButtonMap" "lrm"
Endsection

but this will no longer work as and when xfce moves to using Wayland. It is also hard for novices to figure out to use such a preference file, and what to put into it, under X11.