My workaround for Tesla's lousy navigation system is to put my itinerary into Google Calendar which the Tesla app syncs to the car. In addition to lacking multiple waypoints Tesla also lacks route options. Tesla's nav system is deeply biased towards highways which are the least interesting way to travel. Google maps allows you to select Avoid Highways and it gives you a choice of three routes which allows you to pick the most appealing, I really miss that in the Tesla. The way I force the Tesla nav system to take the route that I want is to add a waypoint to Google Calendar that can only be reached on my desired road. I also use A Better Route Planner when charting the route because Tesla's lack of understanding of even the simple things like a roundtrip means that it can't determine when and where you should charge. I add the Supercharger stops on my Google Calendar as well.