I believe dynamic teams would be really neat. Anyway, it isn't just diplomacy games, [T4R] regularly creates our own historical scenarios with diplomatic elements and some of the suggested features would be immensely helpful.
Introducing these feature wouldn't just pander to a certain group or groups. This would give players the opportunity to create entirely new game types which could easily expand the player-base currently present on Warlight.
Here is an example of the type of games of which I was referring.
https://www.warlight.net/MultiPlayer?TemplateID=625117In short, it is not only just diplomacy games that would benefit from a change/feature like this.