Maybe a deeper customization for weapons, (including grenades etc.) armor and maybe......abilities. Definitely weapons and armor though. Specifically, instead of having hundreds of different guns, we can customize parts. There could be quests and events for different things like barrels, stocks, some crazy energy core thing, armor plates, shields, etc. We would have unique weapon layouts tuned for us personally because we built them. Just a thought. p.s. this would also include us choosing what color things are specifically instead of pre determined shaders.