In case anyone else has this specific issue with the turn signal on the stalk, maybe this will help. I never had a problem with the turn signal not cancelling itself after a full turn. But when depressing the lever to change lanes to the left, I always had the problem of the lever becoming stuck. I would often have to force it a bit to cancel it.
Anyway, I was not thinking about this problem when I went to do a front end alignment. In preparation for the alignment, I planned to make sure that my steering box was centered, but I didn't want to do this at the alignment shop and have power steering fluid ooze out there. So I removed the bolt on top of the steering box at home and used a phillips head screwdriver as I moved the steering wheel to find the little "pit" that indicates that the steering box is centered. Then I removed the steering wheel and put it back on so that it was also centered. Then I drove to get the car aligned. Aside from the steering wheel being crooked, it was not too bad a drive.
The unintended bonus from centering was that my stalk problem was cured.