I was wondering if it is possible to change values predefined in the core XML files in a running game using Firetuner (or some other method) without having to restart the game?
Find config.ini in Documents\My Games\Sid Meier's Civilization 5. Edit the first value so that EnableTuner=1. Now start up Firetuner from the SDK menu. Finally, load up your Civ 5 game like you would normally. Switch back to Firetuner and marvel at the power you have to setup scenarios, including:
Just discovered this myself, it should make testing out some of the crazy scenarios we have wondered about MUCH easier. As one would expect, it is not possible to earn achievements on a game once this has been used.