I found a way to enable all objects in the editor: http://www.multiupload.com/3BUDLGNJA9
Unzip the archive into the game directory, and run runeditor.cmd. After that, you can use all items in the editor, including internal ones. Use at your own risk.
Be especially careful when using dynasty artifacts; you can add them to your map, and your dynasty will receive them completely free of charge. This may not please Ubisoft, and they may lock your account.