So, here's it:
you can type the command "/ss" being in game, and it will request screenshot from any player in the game.
These screenshots will be delivered into http://server.war2.ru/ss/
right after the game finished.
Format of the path format: ss/MonthDay/gameid_gamename/HHmmss(time)_username
As soon as screenshots can take up a lot of disk space, each player has limit: 3 /ss requests per game.
Also going to make autodeleting for screenshots older than some value (depending on the real disk usage, i'll turn it on later).
So, please, note that is not the persistent storage.
That /ss thing works for every 188.8.131.52 version of war2, not working for 184.108.40.206 (that's why 220.127.116.11 is being marked as "unsafe" when it joins the game).
Thanks a lot to Mistral for implementation on the client side.
Also thanks to Lancelight for the idea and some help with the server part (about 5-8 years ago).
Now you don't need to pause the game, ask ss from one of players and wait for them. Just type the /ss, and you will get screenshots for that moment from every player in the game right after the game is over.