The list of "Syntax Mode"s for highlighting in the source editor are different from the ones in the Wiki Markdown.
For example: Markdown supports, through Pygment, ca65 as a lexer - and it it no where to be found in the drop down for source edit mode.
Also, it seems once you leave edit mode there is no way to specify a syntax lexer for a given file extension, file type, or even a specific file.
Obviously thse are not serious issues, just something I noticed.
Thanks!