It is nice that now you CAN automatically un-declare war when a country is dead, but why not make it fully automatic? Is there some benefit to making players un-declare vs. making the game do it for them? Why leave the possible penalty of paying for beign declared on a country that is dead?

reward people for paying attention maybe?

Governments use the idea of war long after wars are actually over. You get to choose what type of leader you want to be. This is a feature =P

Well in FFA, for example, it is simply more leg work.