I think I found an answer to my original questions.
For the first question, I was not able to find a setting to update on the Investment's Settings page, but I did find the attribute 'PBK Project Flag' that I could add through the Configure page on the Project List. Once having added this to the displayed attributes for the Project List, I was able to update Projects to have this value set to 'Yes', after which the PMBOK Template sub-pages will appear for Projects.
For my second question, rather than menus, the PMBOK Document List pages are treated by the application as Subpages. They are set to display only if the 'PBK Project Flag' is set to 'Yes' as can be seen through the 'Object: Project | Partition: System | View: Project Properties | Mode: Edit - Property Layout' page.
Changing the order of the appearance of the Subpages is done through opening the 'Edit Project Properties' page, then moving the order of the Subpages. The example below renders the Subpages generally in chronological order of completion.
Hope this information helps someone else in a similar situation.
Cheers,
Will