you need the no time limit patch. You can find it with a simple google search. With HOI3(and I think AOD and the yet unreleased DH) time limits don't exist and just by changing the year in a text document, anyone with basic knowledge of programming can make the game go into 1964(end date of hoi2: Armageddon)
Events on the other hand require a lot more work, not to mention new nations, ministers, etc
As for those early wars, I going to have to blame bad AI
If you follow those two links in my signature you'll find that I'm creating a mod called The War That Never Was(or as an alt title PTEAP): What if WWI never happened?
I really do apologize for (shameless) self promotion, but if anyone wants to help be my guest. Afterall, have you ever played a mod with a united Chinese Empire that rules all of Manchuria, a Soviet Union led by the internationalist, world revolution supporter Leon Trotsky, A United States of America where Joseph Taylor Robinson is president, and The Greater Austrian Empire rules form the Adriatic to the Baltic sea?