It would simplify changes to the dashboard, tbtnavi, cluster gauges, and potentially other Qt applications if libqtappfw had support for subscribing to and receiving events from signal-composer.  Initially, support should be focused on the upcoming event.vehicle.speed and event.engine.speed events that will be added to signal-composer to abstract the underlying CAN messages.  Following that, at least some of the in the works events for the steering wheel buttons will need to be supported.