Sliders. Knobs. Checkboxes. Such is the spread-sheet roots of strategy games. Let's fix that. Going back 15 years to Galactic Civilizations I for Windows, players managed their economy like this: GalCiv I: Sliders.   In Galactic Civilizations I, you would set your tax rate. Your tax rate affected the approval rate on your planets.  You could then decide how much of your GDP the government would take control of with the spending slider.  From ther...