What I really wish they added to the game was offline, character-based npc occupation and defense of bases.
WHAT?
So, basically, it would have been really awesome to see bases populated with NPC copies of every supergoup member who was offline. If someone came online, the NPC copy would "step out of the room", so to speak. Also, as NPCs, they would serve as base defense if someone were to raid, especially during off-peak hours. Considering the doppleganger tech was in place, it didn't seem like a stretch.
A more sophisticated implementation would allow base builders to put in rally points where those NPCs could cluster if need be and players could set an offline AI strategy--heal, melee, etc. In addition, new prestige sink could be a budget that is set that pays for the number of NPCs to occupy the base at a given time -- a high budget could allow every offline member to be in the base, or a low one would have only a few, random NPCs in there.
I could imagine countless hours spent just trying to raid other people's bases, and it would add an extra element of atmosphere for those "solo" supergroup bases. Think of the challenges and bragging rights....."My base has survived 42 raids and no one was able to take it...."