Okay, so, I know that this might be slightly domestic for a game with such a heavy focus on combat, but in all of Bethesda's games, I get such a kick out of collecting and displaying stuff; I remember my first display case in Oblivion, and how much fun the game was with trophies and trophy cases as an ulterior motive. From the moment I realized I could store and display my magazines in those racks, it was one of my favorite parts of Fallout 4, too. So, here are just a few suggestions.

1) Usable peg boards. I love how the intro scene shows the Red Rocket station, replete with guns and weapons mounted on peg boards. I would love to be able to mount/display my tools and weapons in a similar way.

2) Nuka-Cola storage. I LOVE hoarding Nuka Cola - I never use them, but I collect them. Maybe a fridge/freezer that could store/visually populate transferred bottles? It wouldn't be hard to animate a dispenser tray to kick out a bottle on request; seven years ago, Fallout 3 gave us a Nuka-Cola machine that chilled our sodas - I bet it'd be easy to take that, and add a little bit.

3) Bookshelves (and books!). I was obsessed with the bookshelves in Skyrim, and gathering and shelving rare books was one of my favorite parts of the game. There's a craftable bookshelf under the furniture menu and near the magazine rack, but I haven't tried to build one or see if my "burned" or "overdue" books will populate like the magazines - but even if they do, it's not the same if they're all the... same. I know it'd be difficult to place books in the existing Commonwealth, but maybe in DLC going forward - or, even cooler, add them to the loot pool for enemies and legendary foes, so that it could be implemented worldwide AND utilize some of the randomness/grinding opportunities that's already there from the new legendary loot system.

4) More stuff to loot and display - and boards and cases to hold them. Maybe more magazines - possibly "loot pool" ones like I mentioned above. Maybe rare books. Maybe buttons (the big round kid, for campaigns and schools and such). Really anything that can be collected - from set locations (good) or random encounters (better, since it doesn't require placing in the existing world and because it rewards just playing the game - not to mention adding an element of actual rarity, rather than just being well hidden but available to anyone who can read a game forum's directions).

I can't think of anything else specifically, but you get the idea; hoarding and displaying adds a lot of depth and replay value for packrats like me - and I don't think I'm the only one.