Hm, I'm not sure what I'd say to my fellow captain through an option based system. The crew chat is a little easier because you generally have the same frame of reference. Usually I'd let them who we're targeting, where I plan on flying, helping them be aware of ambushes, etc. Those tend to require a level of detail and specificity you can't get through limited options. It'd have to be toned down to "There's an enemy on my right/left/front/back/up/down!" "Group up on me!" "I'm going in!" "I'm retreating~" Maybe a "I'm going East/West/North/South"