A new Markdown Flavour - dCMS?


We have written an App in FileMaker for creating websites called dCMS.
It creates freestanding site pages using inline CSS, no external CSS references, so it is fast and it is also totally responsive.
The content of each page is defined in the contents of a single text field, using our own flavour of Markdown, a restricted Markdown set of formats with the addition of dCMS tags.
From the Stackedit help I can see support for different flavours of Markdown so I was wondering how I could create the necessary definition file for dCMS Markdown?
Any suggestions would be gratefully received.
Cheers, Nick
PS: more about dCMS here - http://deskspace.com