disabling tap-to-click on synaptic touchpad in ubuntu

I was leant a Dell Latitude D810 that has a Synaptics touchpad.  Eventually, I had to admit that the tap-to-click setting was a little to sensitive and kind of annoying (most frequently, I accidently clicked things in my bookmarks toolbar in Firefox).  I found that I could disable the tap-to-click feature by adding the line:

 Option        "MaxTapTime"        "0"

to the appropriate section of my /etc/X11/xorg.conf file so that it looks like this:

Section "InputDevice"
    Identifier    "Synaptics Touchpad"
    Driver        "synaptics"
    Option        "SendCoreEvents"    "true"
    Option        "Device"        "/dev/psaux"
    Option        "Protocol"        "auto-dev"
    Option        "HorizEdgeScroll"    "0"
    Option        "MaxTapTime"        "0"