I would like to have the ability to describe my map markers to another person or onto the pergament. The way it could work is similar to kin list: you would right-click on the marker name in the list and select "Describe to" option. Then you can describe it to either another person or onto the pergament, same as kins. If other person have visited the minimap where this marker is located then it would automatically be added to his list with the same name. If he haven't visited the minimap then the procedure could fail, because from what I understand about how markers and map are stored there could be technical issues there. But if it would be possible to describe any marker to anyone than it would be a plus. I would be satisfied if it would only work for custom markers, but if it would work for any type of markers then that is even better.
Also I realize that it potentially could all be done through some external means, even automatically. Which I guess could be the reason to not bother with it and handwave it to custom client developers. Still, I somehow feel that it would be right to have in-game means to do so.