Quick question, Which file do you edit to enable/disable city razing in a mod?

The only way, i know so far, is editing XML\Civilizations\CIV4LeaderheadInfos.xml

<iRazeCityProb> tag is different for each leader. Firaxis uses 0, 25, 50 and 75 (for Genghis only). I suppose, changing the tag to 100 for every leader will make the game totally destructive. :satan: ;)

Quick question, Which file do you edit to enable/disable city razing in a mod?

The scenario files themselves. With notepad remove or add the line OPTION=NO_CITY_RAZING.