Base ranking - perhaps additional objectives
So what I have gathered base is ranked based on the number of defenses you have set up. Not sure anything else like player up votes or kills add to the base ranking.
That said, I wonder if the devs will allow us to add additional objectives. For instance I try to add the forsaken tomb within Harvey's path as opposed to closing it off or having the player search for the tomb separately, perhaps something that encourages player to include it.
Lastly I would love to see a key and shield gate* trap with the amount of keys visible on the outpost info.