Please, make it so that your subjects CANNOT make claims when you bring them to war! I'm surprised this hasn't been fixed yet. It is very frustrating to declare a war to make an empire my tributary/vassal, and one of my existing vassals makes a buttload of claims on said empire's territory. And so, I now have to get a whole bunch of extra occupation (on territory that I don't even want) just so I don't have the "demanding unoccupied systems" negative modifier to surrender acceptance. Plus, the subject I just made is now WEAKER because my existing vassal gobbled up a bunch of their territory. Subservient subjects should not be allowed to go over the heads of their overlords and make war demands. PLEASE fix this soon as it makes subjugation war a true nightmare, especially with the return of forced status quo. Not to mention, this makes any war with vassals at your side a nightmare, as you can't really "choose only the systems you want" because your vassals will just make their own demands (which you have to fight for whether you want to or not).