While in the map editor, after you're done placing everything desired, activate the customize rules menu in the scenario bar. Then in the rules bar, select "Edit Rules". Then, click on the "Government tab" and click "All Units Free" at the bottom left of the window. This makes it so that all units cost nothing to maintain. After that, unselect the "Requires Maintenance" box and all city improvements are now free to maintain. You can now spend money on other things, and it works on all the governments. It turns any government into the fundamentalism government of Civilization 2.