I have to chime in here and add that the removal of the negotiations option is a HUGE PROBLEM! (Shouting intended!)
Think of all the "land deals" that actually occured during this period! The Gadsden Purchase, Alaska, the Virgin Islands, Hong Kong, Shanghai, and others. The Louisiana Purchase was only 33 years before the game, Greenland was almost purchased by the US in the 20th C, and I'm sure there are others.
Krupp sold his artillery to anyone with cash, as did Maxim and Gatling with their machine guns.
The biggest reasons, though, to include a negotiations option are the ability to "correct" multinational or foreign peace deals and to roleplay alternate scenarios. For example, say I am France, and allied with Russia, and we are close to crushing Germany. Russian troops are near Berlin, while I control the western half of the country. Suddenly, and for no real reason, Russia makes a seperate peace with Germany, gaining nothing for their hard fought victory. Russia is not about to erupt in revolution, is not entirely bankrupt, and is not on the verge of collapse. Now, France can conclude the war on favorable terms, but can still pass on a few provinces to Russia for their share.
Obviously, this won't be a dealbreaker for me, but it's something I sure don't like. I'm not a programmer, nor do I claim any special knowledge of coding or suchlike, but I have to think that adding this feature should be relatively simple: after all, it was in V1 AND EU3!