I think I have mentioned this before but I would like to push for this again.
One of the great aspects of this game omho is the large maps. They are great, exiting and fun to play with. But they are not easy to navigate. I read somewhere that a minimap may be in the pipeline, which would make navigation easier. But I would like to push for a location marker, similar to the flags already existing in the game (for military units and areas to explore). Some things are rare and it can take time to find them. But when you finally have found them, there is no way of remembering where they are! It would be so brilliant if you could place a marker on the item you found so that it will be easier to find again. Simple, inexpensive and useful.