Whole Trackpad as a scrollwheel

Update: The below is all crap. Turns out the best way to do it is to simply set up in your bashrc a call to synclient setting LeftEdge and RightEdge = 0

synclient LeftEdge=0
synclient RightEdge=0

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Using synclient -l to display all values, find the value of LeftEdge and then set the value of RightEdge to the same value in LeftEdge in your xorg.conf under the 'InputDevice' section:

Section "InputDevice"
Identifier "Synaptics Touchpad"
Driver  "synaptics"
Option  "SendCoreEvents" "true"
Option  "Device" "/dev/psaux"
Option  "Protocol" "auto-dev"
Option  "SHMConfig" "on"
Option  "HorizEdgeScroll" "0"
 Option  "RightEdge" "1752"
EndSection

Source: http://ubuntuforums.org/showthread.php?t=886449