Hm, I will try that, but this seems to diminish the value of autopilot a lot. If I have to control the speed manually I can just as well drive manually and keep full control. This doesn't feel safe. BTW, I didn't mention the automatic lane change, which seemed to be completely useless in somewhat dense traffic. Either it didn't change the lane at all, or it started moving in situations where it shouldn't because a car was coming up from behind.
Honestly, after this experience I suspect fully functional FSD is years away.