>Have the option so some factions can work together to shit on just one AND the predilectes rival faction, one whose negotioation its simply not an option.
>The the minutemen a nonessential choice
>Have a raider ending, and have the option to dominate the other wasteland gangs so they join you, dlc gangs and even the atom cats included.
>Make it so the Railroad gets staffed with free synths militiamen with scavenged Institute armor and weapons, and even join you in some missions (because toasters can be fucking grateful enough to even go against the whole reason as to why they got mindwiped, since they can want actual freedom without pretending to be someone else).
>Have the option to join the Operators.
>Rework all radiant quests (especially if they are time sensitive)
>Have the option to save your wife/husband (i know, there is a mod for that already, i feel like it should be on the base game).
>Have a system to increase levels for settlers and other minutemen militiamen.
>Have an endgame options when joining the institute where you can change some policies on how does the institute behaves so institute fags can finally shut the fuck up with their headcanon.
>Buff vertibirds armor, and make a second vertibird variant designated for assault purposes thats just hovering around and shooting at hostiles thats stupidly hard to take down and yet hits like a truck.
There is a lot of other shit, but basically is making it so that gameplay feels aligned with the story. No shit like one of the best equiped factions in the game having some toilet paper armored choppers with aluminum plating, as well as more faction interaction.