So it seems that there is much more to do than initially, but the way the paths are dealt with is frustrating.
First, you choose between going to Sidorovich at Kordon, Vahtang at Junkyard and Will Wright at Newbar. As soon as you talk to one of them, you lose the other two paths. You don't even need to do a quest. There is no way to know ingame that you lose entire questlines.
Then, when you talk to Sidorovich, you have to notice the very first time he speaks about Wolf, to say that you want to talk to him immedialtely, if you want to pick Wolf questlines.
When Sidorovich ask you which GECK do you want, it opens up two different questlines. (but at least, this time, it is a bit more noticeable)
If you pick Wolf questline, he will, at some point, tell you to meet a general, that will ask you to see one of his two underlings. Each have their own mutually exclusive questlines. (but this time, it is a bit more obvious)
Vahtang questline can also lead you to lead to the general and his two underlings. Otherwise, he only has one questline.
Once you got the Geck from either Vault 13 or X12, you will go back to Arroyo to see your fellow villagers and fail to use the Geck. Then, either see Vahtang or Sidorovich (i don't know what happens if you didn't work for either of them before) to ask about how use it, and they will send you to Pripyat, where the questlines fuse together. Then, you have to pick options for the endings.
It feature slideshows that reflect some of the consequences of your choices. Which are hard to read and replace the original slideshows.
Some issues i still had.
- The eastern maps at Kordon crashes if you try to go there twice, with no quest activated (the same map is used in a different way by many quests)
- Couldn't map the area for Wolf (i had to cheat to validate the quest)
- If you pick Badger's questline, he asks you to kill Vahtang, who has a map for the GECK location. First, you have to trick him to leave the carpet, and then kill him, or you would be unable to loot him. Second, the map item that you loot from him can't be used. Anyway, you can still find the GECK the old fashioned way, through vault 13.
- Toxic Caves have a lot of high-level gear just laying around. It is almost cheating to go there so soon.
- When i reach the CPPN or something with the Gunner, the guy tries to move, but is kind of frozen...In every maps.
- Small issue, but i had to tweak the high-res mod to be able to access the door that lead to the Enclave computer room.
- The additionnal menus created by the modders are always empty.
Definitely think i would have prefered it as standalone.
Didn't found out how to trigger the Nameless One memory. I only have read it in the text files.