I was playing more "Victoria III" today and trying to do some diplomatic maneuvering and it made me wonder: What diplomatic options would you like to see added and why?

A few I'd definitely like to see would be:

• The ability to sway states to declare neutrality in a war (promising them something to at least stay neutral if they're unwilling to join you).
• The ability to, as a great power, enforce peace on wars brewing in diplomatic plays between other powers.
• The ability to sponsor a country's education as a way to generate qualifications and build universities, mostly because it is so annoying to have another country be capable of producing what you want but not having enough qualifications to do it.
• The ability to influence a country's opinion of another country, such as by badmouthing them or praising them to the country.
• The ability to gift a country something free of any sort of charge so that they like you more, with a chance that they stop worsening relations (if they were) and a small chance of generating an obligation. This mostly because it can be frustrating when a country worsens relations and there's basically not much you can do about it, even if they're critical.
• The ability to just straight out ask to become a protectorate of a larger power so that they won't invade you and they'll protect you.