So I've been doing a lot of testing of Smart Summon, and made a video to illustrate some of the issues I've run into. The TL/DW for the video is that there are two enhancements that will really expand the use cases: ability to set waypoints instead of a simple destination, and the ability to tell the car "Watch this!" and show it how to navigate to a particular destination (such as your spot in the garage). In other words, be able to give the car your global knowledge of a particular situation. IMHO this will not only make SS more reliable and useful, but also provide a lot of useful training data.
I'd be interested to hear what others think about potential SS enhancements.