By default, DITA2Go includes all topicref titles in the TOC, except the topicref for the TOC itself.
To also include TOC entries for nested topics:
[Contents]
; UseNestedTopicsInTOC = No (default) or Yes (add them
; as though they were specified in map topicrefs)
UseNestedTopicsInTOC = Yes
To also include shortdesc content in TOCs generated from maps:
[Contents]
; UseTOCDescriptions = No (default, omit shortdesc from TOC) or Yes.
UseTOCDescriptions = Yes
When UseTOCDescriptions=Yes, DITA2Go includes in the generated TOC all text material from the map. For HTML output, the shortdesc content appears in a mouseover. For RTF output, it seriously clutters the TOC, especially for large documents.
The values of UseNestedTopicsInTOC and UseTOCDescriptions apply to all TOCs produced in your current project.