pIqaD, however interesting, is not actually used for writing Klingon. When Star Trek uses the symbols on TV shows or movies, they aren't used as an alphabet; they appear to be used at random, or by artistic instead of linguistic demands. All publications - Hamlet, the dictionary - use the romanization of pIqad, as do email and webpages with it. Hence, as it's not actually used a script in practice, the Unicode Consortium has formally declined to encode pIqaD. If you do want to use it, Michael Everson has put it in his Conscript Registry (http://www.evertype.com/standards/csur/index.html), which is a commonly accepted mapping of fictional scripts to the Private Use Area of Unicode.