It would be cool if you would include the Northern Crusades.

After all, you already have the Teutonic Order. And well, they didn't have much impact on the original Crusades, but they were a mayor force in the Northern Crusades in 12st and 13th century.
A brief history lesson, if I may.
For several centuries the Christians had suffered because of raids by the pagan peoples from Baltic. In the end of 12th century, the Pope called for a crusade against those savages. The crusaders landed at the mouth of Daugava river, establishing a beach-head and a castle in modern Riga. To facilitate the conquering, Livonian Order was founded. By 1210s, the Livonians had been subdued and the Crusaders moved on to conquer Estonia in the north and Latgalia to the south. These areas were conquered by 1220s (though Saaremaa with it's Viking traditions held their freedom until 1261). At the same time, the Danish and Swedes tried to grab their pieces too.
As a result, modern Estonia and Latvia were divided for centuries between Teutonic Order, Livonian Order, the Swedes and the Danish.
At the same time, the Prussians were also conquered.
Source:
https://secure.wikimedia.org/wikipedia/en/wiki/Northern_Crusade and history lessons in school.
Now, how to implement that in to the game?
I would suggest adding Estonia, Livonia, Lithuania, Suvalkija, Pomerania to German war-maps. Estonia and Livonia could be added to Swedish and Norse war-maps too. But there isn't anything to conquer? I think it would be cool to create a strong Barbarian/Independent city somewhere in Estonia (Saarema would be historically accurate and would encourage raids on boats to Scandinavia - the Eastern Vikings did burn the royal city of Sigtuna near modern Stockholm in 1187).
Why Germany? The Teutonic Order had it's roots in Germany and the German people formed Estonia's high society and ruling elite from 13th century up to 20th century under all the different rules of Livonian Order, Poland, Sweden and Russia... I consider this fact to be so important that it should be added to German UHV conditions - maybe a separate UHV condition called Northern Crusade. It would encourage building a huge army, as suggested by current UHV conditions.
Actually, I suggest changing the German UHV conditions to following: 1. Northern Crusade (conquer or vassalize Estonia, Livonia, Lithuania, Suvalkija) 2. Unity of Empire (conquer or vassalize all the area controlled by the historically decentralized Holy Roman Empire in 1650; e.g: Lorraine, Swabia, Saxony, Bavaria, Brandenburg, Bohemia, Franconia, Tyrol, Pomerania, Poland, Carinthia, Salzburg, Austria, Moravia, Silesia, Lombardy, Tuscany) 3. The Reformation (be the first to discover Printing Press). Imagine the challenge: a warmonger AND scientifically advanced Germany.
1648 was the Peace of Westphalia ending the Thirty Year's War, being a suitable landmark for HRE. Now the time-frame for Northern Crusades is more difficult: most of the areas was conquered by 1230, but the tribes in modern Latvia (the Semigallians) held against invasions until 1290...
So, what do you guys think?