I think a way to devise a tactical and organized plan with your other players is imperative. So, right before you go into a facility or wherever, you could huddle up, wherever you want, look at your team mates and hold a button down and then a piece of paper or notebook pops up. This would be on everyone's screen. A rough drawing of the area, maybe even a topographic map would be awesome, but then each player could move their cursor and hold a button down to mark spots or draw lines. Each player would have a different color ink so you could see what there plan is or idea.
This is just a rough sketch idea. My friend and I were playing together, and we wanted to make some plan happen, but there wasn't really anyway to do it besides on the fly. It would be nice to get into the real stuff, and make professional moves.