Thanks to Dave Castiglione for original idea and John Witherspoon for doing it.

Here are instructions on equipping your Taurus with an "express down" passenger window like your driver's door express-down window.  These instructions are written for generation two Tauri ('93s in particular) but
should be adaptable to any Taurus.  I make no disclaimers or warranties, however, and obviously, you modify your car at your own risk (but all this worked on mine).

Obtain an additional express down (aka "one touch down") module (part number F2DB-14B118-AB) from a dealer (about $50) or from a junk yard (I paid $10 for the one I pulled from a wrecked '92 Sable).  If you get the module from a Ford dealer and don't get a harness with the module, you'll have to go to Radio Shack and get some connectors so you can attach wires to the module's male spade terminals.

If you go to a junk yard, pull the driver's door panel from a wrecked Taurus or Sable (you might also try other Fords with power windows) and locate the small black plastic box that's under the driver's door arm rest
near the door's courtesy light bulb.  To remove the door panel, remove the screw in the map pocket and the screw in the door pull handle.  Then slip a flat-head screw driver and/or putty knife between the bottom of the plastic door panel and metal door frame and pry the plastic door panel loose.  Then lift the door panel until it releases from the rail on which it hangs at the top of the door.

Cut the wires on the express down module harness so as to maximize the amount of harness you come away with (you should be able to get at least about 8 inches or so).  Make every attempt to get a module that's been kept dry because it contains electronic parts and a relay that you don't want rusting out down the road.  Also, if you go to a junk yard, be prepared to remove the door panel on your Taurus and swap your salvaged module for the existing one in your door to test the salvaged module and return it on the spot if defective.  A final word of advice for those going the junk yard route: check your yellow pages and call around to find wrecked Tauri or Sables.  The yard will not be able to tell you if the cars they have the modules, but if the yard has cars of the correct year, ask when you can come to hunt around on your own (some places only allow this on Saturday mornings).

Once you have the module, remove the driver's door window switches on your own Taurus by removing the two screws in the door panel just below the switch assembly.  Turn the switch panel upside down, and locate the wire that's in the center of the switch panel between the switches for the rear windows (on '93s this will be yellow with a green stripe -- this is the 12 volt "hot" power source for the window switches).  At least several inches down this wire from where it connects to the switch assembly, strip off a quarter-inch or so of the insulation from the wire and perform an in-line splice.  Use a fresh piece of 14 gauge wire to make a connection from the yellow and green wire to the middle terminal (marked #3 on the express-down module), or if you have a harness, just spice in the middle wire.  You can splice by separating and then intertwining the strands of the bare wires, or you can use an inline splicer part from Radio Shack.  Whatever you do, wrap your connection with electrical tape to keep things from rattling loose over time and to ensure that no exposed wire is left to cause a short when you're done.

Next, locate any one of the solid black wires that's connected to the window switch assembly and perform a similar operation on it as you did with the previous wire (black wires are grounds).  Using the same methods
as before, connect the black wire to the terminal that's labeled #5 on the express down module.  If you can't read the numbering on the module's spade terminals, look at the module from the end and turn it so that the two large terminals are on the left and the three smaller terminals are on the right.  From left to right, the two large spades are 1 and 2, and the three smaller ones are 3, 4, and 5.

At this point, find the wire connected directly underneath the part of the driver's passenger door window switch that you would push to make the window go down (tan wire with the blue stripe on 93s) and, about six inches from the switch panel, cut this wire all the way through.  Strip enough insulation off the ends of the cut wire to make connections.  Connect the piece of this wire leading down into the door to the terminal marked #1 on the express down module.  Connect the piece of the wire that's still connected to the window switch assembly to terminal #2 on the express down module.

Locate the wire connected directly underneath the part of the driver's passenger door window switch that you would press to raise the window (white wire with the yellow stripe on 93s).  At least several inches down
from the switch assembly, strip away a quarter inch or half inch of the wire's insulation.  Use a fresh piece of 14 gauge wire to connect this to the terminal marked #4 on the express-down module, or spice in the #4 wire
from your junk yard harness and module.  Again, be sure to wrap your connection with electrical tape to keep things from rattling loose over time and to ensure that no exposed wire is left when you're done.

Flip your window switch assembly right-side up and, from the driver's seat, test how the driver is able to control the front passenger's window.  It should now operate just like the express down driver's window.  If it does, congratulations -- you did it!  Take the switch panel off again and use duct tape to attach the new express down module somewhere down inside the door.  Then reassemble the switch assembly.  If the window doesn't work as hoped, review all your connections and try again.