The solution I found was to use the Tap Zones feature of the touch-pad software and assign a macro to edge taps.
Synaptic WILL let you modify the settings for Tapping, Enable Tap zones and then assign the action of 'Record and play a sequence of keystrokes' to a tap in any one of the corner zones. Sounds great, right? Unfortunately you CANNOT assign any kind of windows-key action through the macro sequence recorder.
The solution for me was to use AutoHotKey and bind Synaptic to something like Ctrl+Alt+[
then modify the AutoHotKey script to Send #{Left}.
My AutoHotKey script looks like this:
^![::
send #{Left} ; winkey left is bound to synaptics Bottom-Left action
Exit
^!]::
send #{Up} ; winkey up gets bound to synaptics Upper-left action
Exit
Now just make sure you temporarily 'Suspend Hotkeys' in AutoHotKey while you are recording your Ctrl+Alt+[
macro or it won't be able properly record the keypresses.