I do appreciate that reStructuredText is extensible and Markdown (currently) isn't. I don't think that's an argument that outweighs rST's verbosity. But I do th

I do appreciate that reStructuredText is extensible and Markdown (currently) isn't. I don't think that's an argument that outweighs rST's verbosity. But I do think it's an excellent argument for adding a standard extension point to Markdown.