I just read an article on Kotaku and thought I'd share it with you guys.
On this facebook page, everyone interested can make their submission for the story of an in-game quest that might be implemented into the game. I think this is really interesting, especially for a game with such a vibrant community as the S.T.A.L.K.E.R-franchise. I've only played the first installment, but it really was a blast, especially with the right mods.
If you haven't tried the game already, I recommend picking it up, it's bound to cost like 10$ max and if you buy it second-hand it will be even cheaper. Then install the Oblivion Lost mod and enjoy!
Thanks for reading.