Pardon for not saying so in the original post, but I tried to do play a custom scenario with the map. The leader seems to be locked as Louis XIV. I was able to play as Napoleon by changing the .wbs file but not as DeGaulle. Perhaps the definition file that the program looked for didn't have DeGaulle defined. The French civ wasn't present on the selection menu when the leaderType variable was at LEADER_DEGAULLE or even LEADER_CHARLES_DEGAULLE.
I'll try copying the leaderhead.xml file from the BTS directory into the mod directory, but right now I'm too busy preparing an invasion of the panama canal and Inca (that bugger built the Mausoleum of Maussollos before I did and my next golden age can't start without it! Besides, I need the obsidian and the mean little Aztec right up north won't trade it to me...)