It would be exceptionally helpful to be able to see at a glance which quests / POIs have been completed. Active quests and POIs are all white, while NPCs with no remaining quests are yellow.
I would propose that markers should be a more distinguishable colour to indicate that they are not complete (e.g. light blue or yellow) and white or light green to indicate completed ones. Currently, if I've forgotten which POIs I have done, I have to hover over them individually to display the tooltip, which can be tricky if they're very close together.
