I've been playing this game for a little over a year now, and I can't believe this mod flew under my radar for that long- it's exactly the kind of mod that I was looking for; one that adds a sort-of 'endgame' to the run. Haven't really found anything like that until this one.
I recently began running solo runs where I'd start at the military facility west of Rosewood, and need to gear up and reach the Grand Ohio Mall for extraction within a week. It's proven to be an extremely fun experience- I even ran the same gimmick-run with a friend in B41's multiplayer, and it went off without a hitch (I made sure that my friend extracted instead of me so the server didn't close instantly, but it seems you're aware of that issue already, amongst others like the 'strenght' typo, so I trust you've already considered an alternative or fix for this in the future.)
News of the 'expansion mod' is also delightful to hear- there are many buildings/locations on the map that I think would make great venues for the quest, and potentially seeing them included as new extraction points is an exciting prospect.
Just wanted to say that I really appreciate your work with this mod, and sincerely hope you continue work on this project and continue updating it! Thanks for this, seriously.