In terms of supergroup base customization, I think one thing we're really missing is a broader range of peaceable NPC's. I think this is especially true for the NPC's who are performing emotes and actions: such as typing, researching, clipboard emote, etc. Would it be possible to get more NPC's for those actions? Typing is an especially desired one for me and my friends, to replace the civvies in our base with more super appropriate workers.
I figure these would range from Longbow, to guys in labcoats, to magic themed NPC's, police officers, all sorts. Of course villain related NPC's are also needed: more arachnos personnel, or men in fine suits for mobsters, or other such theme appropriate NPC's to really round out an idea - make it feel more like the group has connections and relationships with other in universe organizations.