Has someone made a mod yet where you can have 16 civs on a small or tiny map? I read some time ago that a gameplay with a lot of civs and only 2 or 3 cities to worry about, was a very interesting game.
That is one of the easiest things to do.
1. Open the editor
2. Uncheck 'Use default rules'
3. Click the dropdown menu and select world sizes
4. Select Tiny and change the number of civs to 16.