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A bit late but there is another candidate. The Routing API of the GraphHopper Directions API has an optimize=true parameter and supports several dozens of locations (dependent on the purchased package). And with the Route Optimization API you can solve a lot more complex problems with time windows, capacity restrictions, multiple vehicles etc Disclaimer: I'...


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The PostGIS extension of PostgreSQL contains an executable (shp2pgsql) to import shapefiles (.shp) to PostgreSQL. The pgRouting extension contains functions for the routing of networks (ways), such as pgr_dijkstra(). You could either write a stored procedure to do the automation or use python to access and automate the functions.


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Since RoadGraph is older than virtual fields, the issue is most certainly that nobody has added support. You can add a feature request at http://hub.qgis.org/projects/quantum-gis/issues/new and set the category to C++ plugins/roadgraph


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Disclaimer: I work for iGeolise To model travel times you can use the TravelTime platform API. It uses a range of transport and map sources to produce travel time isochrones including ATOC, DFT, TFL and open street map. The image attached is an example isochrone of all locations reachable within 45 minutes using public transport from Waterloo in London (...



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