What if we could actually go inside our ships and walk around. Like in Mass Effect, granted they dont need to be anywhere near as big as that, but itd be kinda cool to be able to go in your ship and decorate it with stuff (the heads of your slain enemies, maybe?). And on that note, being able to invite people in our ships to show it off or chill between missions would be needed also.
Another thing would be rooms/apartments in the tower, and clan bases as well. Maybe like 10,000 glimmer for the apartment and like 75-125,000 glimmer (clan-mates can all put money towards it) for the clan base, or some set prices depending on how big the clan is.
Just a thought, this stuff would definitely add to the "social" aspect of the game.