I've just read this month-old thread and am now more confused than ever. This fellow seems to have had success running a 105 FD with an x.7 trig shifter:
http://www.bikeforums.net/showthread...ont+derailleur
Even if this didn't work, would it be possible to get a Shimano "flat-bar" R440 left-hand shifter and use it with the Ultegra FD?