My thought was you would need a messenger to get through to learn about what happens out of system, so if your survey ship gets jumped and you don't have any back up in the system with it you won't know something happened until it is overdue.
On the topic of rules, several folks have sent me info regarding diplomatic teams, I should let you all know that you are responsible for diplomacy and that will be handled in RP, the game has a way of making everybody become the best of friends after a few years of diplomacy and then they start randomly throwing tech at each other with no regard for the players decision, so I let your relations all decay to hostile so that we don't have to worry about it until or if you guys want to. I can always SM any required level of cooperation.