Is there a way to make the empires develop in a single-way fashion? For example, all empires should follow the path expanding->fortfying->degenerating->rioting->all will be ashes. The moment they change states would still be random, but they could not change back to a previous state (a degenerating empire can change to a rioting state, but not to an expanding or fortfying state). Is it possible to do so in the current game?