Start the game with the command line parameter /cheats=1. (Right click on the desktop shortcut and chose Properties then ad /cheats=1 at the end of the "Target" Field.
While you are playing after you do this press ~ to bring up the console. Then enter sys cheats 963 which will activate cheat mode.
Enter any of the following:
| cheat lord | God mode |
| cheat decap | Headless character |
| cheat teleport | Teleport |
| cheat suicide | Suicide |
| sys cheats 369 | Disable codes |
Turn blood back on:
In the settings.cfg file change ?Violence=2? to ?Violence=1?.
Save, then start the game.