To be honest, I can't see why you would want them - all the additional complexity on what is a very simple and basic workhorse. Either get into the habit of checking the idiot lights every so often, or fit a bleeper which will remind you (and alert pedestrians when you are in city traffic).
I had a Citroen 2CV many moons ago, which had (uniquely for a car, in my experience) indicators that you had to cancel yourself. It took about a day to get into the habit of flicking them off after you had completed the corner. I had the self-cancelling ones (time and distance) on one bike I had (can't remember what) and they drove me mad. They would always cancel just when you got to the corner, and you had to fiddle about resetting them when you needed all your hands and fingers for the controls.
Simple = reliable = good, in my book.