- In addition to the level editor, othe mod tools for Doom 3 include the sound editor, the script editor (all the AI in the game is handled by Doom 3's script code), the particle editor, the articulated figure editor (used to create ragdoll skeletons for the game's character models) and the GUI editor. Duffy said the editor was actually created by Raven Software for their work on Quake 4 but that the editor is a bit crashy due to id Software's own work on the GUI code (most of the GUI code is done by hand in Notepad, according to Duffy).

- Even though the gameplay doesn't lend itself to vehicles, Doom 3 does support vehicles and when the SDK is released a sample map will be included that will have a six wheeled buggy in it, which will help with mod makers who want vehicles in their mods.

-The biggest hurdle for mod makers interested in full total conversion like games for Doom 3 is the artwork, admitted Duffy. He said most of the artwork in the game started as a 3D model and things like character models had over 1 million polygons before they reduced them down to be used in the game. id plans to release exporters for programs like Maya and some sample character models for the game in order to help mod artists with their work.