Unfortunately I do not have an N9, and I don't have the money to get one. If someone else is interested in getting it running though, it should be simoke in theory. Is pocketsphinx in the N9 repos?
javispedro npm, btw, I write a Maliit input plugin to add dictation support to all harmattan apps using pocketsphinx javispedro npm, https://gitorious.org/javispedro-n950-misc/maesphinx