Not sure if this idea has been brought to the table yet, but I thought it would be cool to see rankings on non-ranked maps. For example, Snow Drive (just using this as an example) and someone beats the map, they are then prompted with a box "Would you like to publish your score" you could then see scores just like a regular ranked map on the left-hand side. Would be cool to see replays of people beating the harder beatmaps that are graveyarded.