Multimarkdown looks like it just adds some extensions to markdown (as far as input goes). From a cursory look what's added to the markdown format by multimarkdown is already supported by extensions provided by Python Markdown.
Right now the footnotes and tables extensions are the only ones enabled. I might be a good idea to check what other extensions we're including and allow those to be optionally enabled. I believe only footnotes and tables were enabled because some of the others were tripping people up when enabled.
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