A lot of suggestions here that I would love to see implemented.
I have no clue how many of them are possible, but I can hope, right?
Customizable NPCs would be a huge plus for me. Along with more NPC models from different factions in game.
Larger base plots would always be a plus, too.
Some items I would love to see added to the base editor would be more weapons. We have some nice ones already, including some that don't appear anywhere else in game (as far as I know, anyway) but we have a ton of weapons in the character creator that I would also really like to see in the base editor. (Titan Weapons in particular come to mind...)