With the coming of Unicode 4.0 (which has support for more than 65536 characters), pIqaD will probably be assigned an actual official character range (probably near U-00012100, according to at least one document I've seen).

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.