~$ xinput

⎡ Virtual core pointer               id=2  [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer     id=4  [slave  pointer  (2)]
⎜   ↳ ETPS/2 Elantech Touchpad       id=12 [slave  pointer  (2)]
⎣ Virtual core keyboard              id=3  [master keyboard (2)]
    ↳ Virtual core XTEST keyboard    id=5  [slave  keyboard (3)]
    ↳ Power Button                   id=6  [slave  keyboard (3)]
    ↳ Video Bus                      id=7  [slave  keyboard (3)]
    ↳ Sleep Button                   id=8  [slave  keyboard (3)]
    ↳ ... USB2.0 WebCam              id=9  [slave  keyboard (3)]
    ↳ ... WMI hotkeys                id=10 [slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard   id=11 [slave  keyboard (3)]

~$ xinput list-props 12

Device 'ETPS/2 Elantech Touchpad':
        ...
	Synaptics Locked Drags (283):	0
	Synaptics Locked Drags Timeout (284):	1000
	Synaptics Tap Action (285):	0, 0, 0, 0, 1, 3, 2
	Synaptics Click Action (286):	1, 1, 1
	Synaptics Circular Scrolling (287):	0
        ...
	Device Node (261):	"/dev/input/event4"

~$ xinput set-prop 12 283 1

~$ xinput set-prop 12 284 5000

/usr/share/X11/xorg.conf.d/50-synaptics.conf

/etc/X11/xorg.conf.d/00-enable-taps.conf

Option "LockedDrags" "1"
Option "LockedDragsTimeout" "5000"

// /usr/share/X11/xorg.conf.d/50-synaptics.conf

Section "InputClass"
        Identifier "touchpad catchall"
        Driver "synaptics"
        MatchIsTouchpad "on"
        MatchDevicePath "/dev/input/event*"
        Option "LockedDrags" "1"
        Option "LockedDragsTimeout" "5000"
EndSection

// /etc/X11/xorg.conf.d/00-enable-taps.conf

Section "InputClass"
       Identifier "tap-by-default"
       MatchIsTouchpad "on"
       Option "TapButton1" "1"
        Option "LockedDrags" "1"
        Option "LockedDragsTimeout" "5000"
EndSection