RPM: check out
http://www.keyhole.com/kml/kml_tut.html
and look at section "4.1 Tracking a Point Directly Under Your View".
Not as nice as having the lat/long easily accessible in txt form, but will easily create a placemark at around the center view (that should be easily hidable). this method would also let you set directions from any "center" point, ie pause goops or whatever GPS pipe, move to the desired start location and determine directions with whatever method you are developing.
Seems like the easiest way to implement 'from' location for directions is w\ placemarks. having a placemark at current position and refreshing driving directions every few seconds would be a feasible way of adding routing.