Yeah Alan, I do the same thing. Harley not only has self cancelling, but there is a turnsignal switch on each grip.
Also, the Kisan Signalminder will shut off the signals after a pre-set time. I'm not sure the GeeZer has ebough juice to push it, but I had one on my Intruder Chopper and It works fine in 90% of turn situations. Being timer based, sometimes it wouuld shut off too soon, but otherwise AOK.
Turn Signal Canceller