Hi I'd like to suggest several more addtions to diplomacy menu:
1) Donate money - some faction often goes bankrupt. We should be able to donate money for them for better reputation.
2) Show relations between factions (neutral, war, allied)
3) Ability to become allied with the factions and fations join/break alliances
4) Ability to buy spy information about faction (e.g. ship list, maybe loation of particular ship, location of their stations)
5) Ask for help and allies call for help (e.g. you are attacked in one sector you can ask faction to send help there, but also if faction is attacked they will ask you to help)