Eu adicionei isso no meu rc.lua para gerenciar o synclient.
local awful = require("awful")
-- {{{ Autostart applications
function run_once(cmd)
findme = cmd
firstspace = cmd:find(" ")
if firstspace then
findme = cmd:sub(0, firstspace-1)
end
awful.util.spawn_with_shell("pgrep -u $USER -x " .. findme .. " > /dev/null || (" .. cmd .. ")")
end
run_once("synclient MaxTapTime=0")
Requer que seja horrível ser instalado.