Selecting more than one nodereference field

This would replicate the functionality in the gmap macro using feeds, though would be much better from a UI perspective, since the user doesn't have to know the specific ids of taxonomies etc. My intended use is to have a green marker for starting point, a red marker for ending point and numbered markers for waypoints in between. See http://samipath.kulturarkitektene.no/node/3 to see an example of the intended result. (Zoom out to see the end point.)