I want to do it unique, so what do you want to see in Fallout 4 and why? Now, "because it would be cool" isn't good enough reason. Basically despite the fact that Bethesda's Developers are done working on it, I want them to look at this thread and say "wow they want these and give amazing examples and reasons why they should be in Fallout 5".
I wan this to be a positive thread, so DO NOT harp on the Devloper's for doing something wrong. Until you yourself create a better Fallout game, not with mods I'm talking about a full on game, then DON'T get mad at them for trying to give us an amazing game.
Focus on the positives, ignore the negatives. Or you'll never like the game.