Make it possible to trade military equipment again. It is historically known that countries traded in military equipment (not soldiers, so we should allow military trade in equipment and not in infantry, militia, mechanized or motorized infantry, commandos or paratroopers.). This will make team play more efficient by allowing novice inexperienced players to defeat even experienced players while playing as a team, as by distributing research objects they will be able to develop techniques of their chosen species and sell them to their allies. Also buy other types of equipment from them. I love this game and want it to be more realistic.
"Any man who must say, 'I am the king' is no true king." - Tywin Lannister