I would love to see, for some future version down the road, support for NATS/PACOTS/AUSOTS (North Atlantic Track System, Pacific Organized Track System, Australian Organized Track System) tracks that are used for trans-oceanic flights. These tracks change every day, and they can be publicly downloaded. QSimPlanner (github.com/jetstream96/QSimPlanner) downloads and uses the tracks, and that implementation could be a good place to start. These tracks are ways to specify more direct routes between points across the ocean from one another. As an example, with NATS, you can fly EGLL-KJFK straight across, and without them you'd have to fly EGLL down the coast of Spain and over, then up the coast of the USA. Much longer distance-wise and all.
Just my thoughts for the day. Thanks for your consideration, and for such an amazing product!