Wondering if its possible to have bezier-like curves to make directional arrows on maps look more natural and to be able to flip the curvature to reduce when overlaps occur (to arrivals and departures tend to be stacked on top of each other and are indistinguishable).

Example of maps with 'bendy' curves:

http://balaspa.50webs.com/mappingiris/
http://www.heathrowairport.com/flight-information/route-map

Current Omniscope: