Synaptics TouchPad Toggle

My new work laptop (Dell Latitude 3540) doesn't toggle touchpad on/off via hardware level, the key combination (Fn+F3) is merely XF86TouchpadToggle which XFCE [still at the moment] doesn't know what to do with.

I made a simple synaptics-toggle script:
if [ -f /tmp/synaptics-touchpadoff ]
then
    synclient TouchPadOff=0;
    rm /tmp/synaptics-touchpadoff;
else
    synclient TouchPadOff=1;
    touch /tmp/synaptics-touchpadoff;
fi

and mapped the script to XFCE keyboard binding utility. 

Upon finding ArchLinux more elegant solution here, I had to admit I was a bit ashamed.