I already created and configured a PBI module for pithos and added it to the build server. I actually had to tweak the standard EasyPBI module a bit in order to get it to work, but it seems to be working now except for the fact that no sound comes out of my speakers (but I have been having issues with an unconventional sound setup for my system recently).
If you would like, you can download the module  and build it with EasyPBI on your system as well to test it out.
-or- "svn co svn://svn.pcbsd.org/pbi/modules/audio/pithos"
Yes, EasyPBI is a (relatively) new tool for creating PBI's on your own system, rather than forcing a user to wait for the PBI to appear in the AppCafe. However, we still are very active about filling PBI requests posted here on the forums, and ask that if a user does build a personal PBI for their own use (using EasyPBI), to please send the module to the PC-BSD pbi-dev mailing list so that we can get it added to the AppCafe for others to use as well.
FYI: There is a shiny new version of EasyPBI available in the PC-BSD repository that will be included with PC-BSD 9.1. This version has had the back-end completely rewritten and allows full editing of PBI modules within the GUI in addition to fixing the PBI build bug that the current PBI in the AppCafe has.
To get this new version; from a terminal run:
"svn co svn://svn.pcbsd.org/pcbsd/current/src-qt4/EasyPBI EasyPBI-source"
then cd to that directory and (as root) run "qmake-qt4 *.pro; make"
This does require that you have the PC-BSD "Development-Qt" system package installed in order to run.
Have fun with it!