I've tried to include as many commands and environments as I could from the memoir class, though I wasn't able to figure out how to do many of them since they take more arguments or options than I could accommodate within the LyX layout file. In some cases, as with the \epigraph command, I've made the quotation be the body of the Epigraph paragraph, with the author to be inserted as a "Short Title" (under the "Insert" menu), since the "Short Title" actually gets passed as an optional argument to the command.
In other cases, as with the \hangpara command, I've done the same trick (where the "Short Title" specifies the number of lines to be "hung" by the paragraph), though I've had to stipulate that the width of the "hanging" be 2em. This use of LyX's "Short Title" is certainly counterintuitive, but it gets the job done.
Perhaps there ought to be a way in the definition of layout files to make handling extra arguments/options easier or to make it possible to specify more than 2 arguments within LyX. (Or perhaps I'm just not seeing how this could be done.)
Of course, comments or suggestions for improvement would be welcome.
Bennett Helm
memoir.inc
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memoir-book.layout
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memoir-article.layout
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