KotR was fairly effective at using edicts and CA's as a means to limit expansion.
It's down to resources and game balance.
If it costs too much to have more than one war going then the internal fighting over who could expand and who had to wait was a big part of KotR's balance mechanism. The problem is that some players can take on whole armies with little or no support except GB units. Likewise an ingenious piece of legislation was that all provinces taken had to be "ratified" and officially absorbed into the Empire. Because this was further legislation it became very political, which was very effective. If you set out expansion in the “constitution” of the game it can be role played as such and allows land to be the centre of political manoeuvring and voting.
I think it was fairly realistic that you had to decide as a group of Baron's and nobles in the Diet about who to attack and who not to.
-EDIT-
I honestly think CA and Edict that are "in-game" need to be policed and enforced in the game and not outside it. If you don't do this you will need a babysitter for all the toys that get thrown out of the pram. *grin*
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