I posted this already but in the wrong section, so here it is again!
One of many major improvement would be to add waypoints before a ride so that you can customise your session into exactly what you have time and want to experience.
Using manual "turning through the app is ok but shouldn’t be only way of riding customised routes.
So one easy way would be an interactive overhead map before entering the game. Then use a waypoint system to fill in the sections you want to ride, once it´s locked… Ride On!
As it is now you´ll have to check with http://zwiftblog.com/category/courses/ only to see how the course look.
Also I think that being able to zoom out from the map in realtime while riding would really add to your session.