I agree that structural components should be allowed to phase through each other. I can understand for interact-able objects, there's just no lee way. Beds and such just need room for characters to finish their animations in without falling through the world. Walls, though? The amount of times I haven't cursed begin to be outnumbered by the times I have when constructing. I wanted to build a pazio around the Drive-In building and I got things just right only to find out that while it'll accept the wooden floors, it won't accept the walls that complete the damn thing.
I also want the ability to build higher walls without having to build a roof and a floor, a second wall, then remove a roof and a floor. I just like space in my buildings, I'm slightly claustrophobic about ceilings because of my height IRL (6'6''), so the ability to snap walls right on top of each other would be a lifesaver.
Pardon for all caps; WE NEED FUGGING INDOOR DIVIDERS WITH DOORS, WHAT THE [censored]. Seriously, I can't create separate rooms with separate doors? What the hell?
I would like to be able to cover up the inner walls with something more pleasant-looking, a bit like how you can/must place floors on top of roofs. Just do the same thing inside and allow me to complete the picture. It looks so cold right now.
I want to be able to assign my companions. ATM, none of my companions can be assigned, while I hear on the console versions you can. This is particularly, eh, important to have romantic companions be sleep in the same bed consistently. I don't want to have to construct a cage around Piper to keep her in place while I take a nap or have to switch out companions everytime. Oh, that reminds me; I need to be able to assign myself a bed so settlers know not to [censored] with me. LIterally and figuratively. And we need double beds.
In fact, all companions should have a "doghouse" specifically for them, so they can be found with relative consistency. I should be able to open an office for Nick Valentine in Sanctuary or create a recharging pod for Codsworth or Curie.
I want display case-mechanics for more things. In the starting menu, you see various tools hanging from tool racks, so I figured that was an option. Instead, I had to lay them on shelves, which is literally and figuratively clunky. Heck, if I set up mannequins on top of guard posts, I expect defense points for intimidation for the type of equipment they are wearing.
I think that an overgrown Eyebot could probably be a good excuse to be able to access the workshop inventory while in the field. As a designer, I notice that, unlike in other games, I am less willing to sell all my stuff to vendors. I think that is a more interesting challenge for a player than wrestling with weight limits; wrestling with the fact that they probably just have too much to navigate through efficiently with any kind of UI. So, a mobile Supply Line, basically.