I believe the issue your getting tetryds is due to the Kerbals being synced among all players from the server. *\DMPServer\Universe\Kerbals\(Kerbal Name).txt That file contains a basic flight log including flights to, suborbits arond, orbits around, excape from orbit around, landing on, boarding from and exiting to for each kerbal for each planet. Im not sure when the sync happens but once your copy of that kerbal has those flight logs those missions can be accomplished. It doesnt track flag planting or specific locations (visual survey's) etc. As for a hack to allow shared content between players you could use a symbolic link for the files that are player specific and have them point to the same file. I havent personally tried it, and I'm not sure how often the server writes and reads these files for the client but it could work.