Well first of all i think that when you as romania or italy,turkey or even yugoslavia (country's i played and joined the germans on their assault on the soviet union) should if they conquered the respective regions with their own troops get them and so it would be correct
I mean many times i reached stalingrad on my own took all the ukraine and the caucausus with my own troops no real help from the germans who ussualy don,t reach mosocow before i get to Stalingrad but some help from the 1 or 2 balkan pupets i usualy make .Now it really annoyes me that i lose the teritory i conquered without help from german troops my ic and resources suddenly drop a lot and it's really annoying.
As for what should romania get well historicly they got everithing to the Bug river on the map aproximately bessarabia and the 3 provinces beyond it.