2 simple suggestions that would game DST great fun every must like:
ability to freeze server time (server pause) when not all of the players are in game. - this is to prevent people skipping winter or difficult situations simply by logging out. I fully understand this is not practical for big servers but its great for 2 -4 P games.
shared one life pool instead of ghosts ( I dont mean shearing hit points) - make whole team on the server have single life and once one person dies game over for whole server. Leave same resurrection options viable and working same way as in single player. This will bring original DS rogue like feel that I miss so much. This is again great for smaller closed servers of friends that want to challenge them self.