hi klaus,
it could be fine to add the following attributes in map plugin tag :
marker1=""
marker2=""
markerXoffset=""
markerYoffset=""
then we may customise the map markers by loading any .png or .swf (for animated marker) over the map,
with a conditional in the map plugin code ,
if theses attributes are empty, else use the embbedded marker1.png and marker2.png from the googlemap plugin by default.
the offset parameter allow placement of different markers size for lat/long placement
See U