The first draft of the Psychology Module is now done (kinda). It lacks all the modifiers and advanced rout rules (later plug-in) but hopefully it gets across the concept of the Mentality Attribute and why it's so important (and why it's the first of the MARS Attributes).
This is not part of the core rules. It is an optional add-on module.
The psychology module is intended for mature gamers who have been around the block a few times, not because of any complexity, but for their understanding and what they bring to it.