User Story: As a specification writer, I want to be free to create pages in my specification that aren't specs, in markdown, Excel or HTML/XHTML, so that I can structure supplementary information in any way that I think my readers would find most clear and organized, while at the same time being able to take advantage of the convenience and readability of markdown syntax or Excel spreadsheets over HTML.

Hi, Nigel! I'd be happy to code this up myself, if you could point me to the packages and classes I should be editing.