Ive done a script to map click buttons on keyboard, its very confortable to use, and i've not used touchpad buttons anymore since then.
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Mapping Windows Key funciton as left touchpad button
Mapping Contextual Key function as right touchpad button
1- mousebind.sh (script to map keyboard to touchpad buttons functions)
2- normalmousebind.sh (script to restore default mapping keyboard)#!/bin/bash
sleep 15
# set XKB layout
setxkbmap -layout es
# turn on mousekeys
xkbset m
# stop mousekeys expiring after a timeout
xkbset exp =m
# map keysym to other keysym
sleep 1
xmodmap -e "keycode 133 = Pointer_Button1"
xmodmap -e "keycode 135 = Pointer_Button3"
#!/bin/bash
#restuara teclado
xkbset -m
So you add script 1 to startup, and enjoy
i'd recommend using middle finger, left hand for Windows Key, middle finger right hand for Contextual Key