I seem to remember latexmk should be included since ver 0.4 TexWorks. I have ver 0.5 r.930 Debian installed on Deb 6 64 bit. Also I have Texworks 2011 installed in my home folder. So why doesn't latexmk appear on the list of typesetting options and how do I get it to?
I prefer to avoid manually setting it up in preferences. I want it prepackaged.