Is there any way of being able to include OSM external data directly into Graph:Street map with marks in the way you can with <nowiki><maplink>. Being able to show a particular administrative boundary, highway etc would be really valuable. Thanks.
Topic on Template talk:Graph:Street map with marks/Flow
It is possible, because graph extension supports geoshapes requests, but it has to be implemented in the street_map graph. I actually do something similar in this demo: Template:Graph:Country_with_regions_and_capitals.