You run campaigns all the time. Want to make a push into another empire's territory to take a major resource node? That's a campaign. That's the beauty of SoaSE. You make your own goals. YOUR the emperor. You make the rules, you set the goals. You lead your growing empire to victory or ruin.
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What he said, I agress, I mean you are emperor, you should not be told what to do, but ask nicely? Anyway, if something happan in your action, it's base tell you what happan story there, Emperor (It's you) should stay at homeworld planet or move to other planet as needed to be, but personal emperor can command from his own personl flagship like Star War where he command from death Star, and his other SSD or ESD was it? but it never done, only Darth Vador got his own. Too Bad it's didn't has one in Sin of Solar Empire, It's would be cool if your homeworld or your own way speal ship that's can't be build unless happan if you are one planet while your personal ship is destoryed, can build again and pick up emperor (You).