While playing Stalker Online, I opened the map to check it out but it only has the markers for the exit of the town and safe zones. I had an idea of making custom markers for the player buy selecting a symbol from a preset list then putting a description next to it. for example:
Favourite Repeatable Quest. The only other game I know that really has this would be Tibia. I think it would a pretty neat and useful thing for a survival game.