I also asked Marc again about using {-Ha'} on adverbs. He said that if it makes sense, then {-Ha'} could be used. I offered the example of {tlhIngan Hol neHHa' vIjatlh} and he translated that as "I speak not only Klingon" as in "I speak many languages including Klingon". He say that {vajHa'} still doesn't make sense.