ok i got idea for quest (there will be only main quest with some parts you wont NEED to do (but with nice reward) there will be NO NPCs! You wont hear or talk to any people (no need for charisma speech and barter), its important for my idea of main quest. I dont wont to spoil ending ideas, but youll try to find survivors like in IAmLegend, so you have to be alone (with doggy and zombies) for looong time. Youll start main quest by turning on any Ham Radio you found, by getting sos signal with message, which will point you to a certain direction... so then youll follow the trail of certain notes (holotapes? well i said no human voices...) which will tell you where to go (not just go there and do that, more like notes of some professor who is trying to find a cure or maybe save some survivors, like: "there was nothing here, now ill go 'there' " or "i found what i was looking for, now we just need 'something' "... side quests will be like 'optional' parts in FO3, like in note you found: "...(main quest task)... so we separated, they went 'there'. I wonder if they will survive" or "... we need food, i think in super duper mart will be some" (well, not in this stupid way, i just dont want to spoil, or say something there wont be) also so you wont be able to skip large parts of main quest some doors (mostly vault doors?) will be locked with codes (which youll find in those notes) i already have ideas for 2 optional endings, and both of them seem crazy and second one you probably wont expect at all :D