Today I also took a look at Maps' qml codes under /usr/share/maps/qml, hoping I could find something interesting.

But the only thing I found was a setting to enable automatic 2D/3D transition (e.g. zoom out becomes 2D, zoom in becomes 3D), but the implementation wasn't robust. I didn't see any TODO and traffic-related info. The components implemented in QML are limited, most of the meat are hidden under C++. Maps uses a private MapViewer element for displaying the map, and the codes don't reveal much of what features this object supports.... Overall, the qml codes for Maps is kind of messy compared with Drive's.

The only things I changed so far are exposing the auto 2D/3D feature (not worth it) and get rid of the Analytic element...