No, the priority field is from within the compiled portion of the QubeGUI.
The only things that are accessible to be modified when running the qubeGUI are the app-specific sections of the simpleCmd modules, which are still interpreted python.
You can always d/load and install Python, MySQLdb, wxPython, NumPy, PIL, & py2exe, edit the qube.py, then run "python setup.py" to build another compiled GUI that you can distribute to your users.
See QubeGUI->Help->QubeGUI Developer Guide for more info.
I'd recommend:
ActiveState Python 2.6
NumPy 1.4.1
wxPython 2.8
MySQL-Python 1.2.3
(Can't find or remember the PIL ("Image") module version)
All of these have pre-built binaries, either .msi or .exe installers. You won't need to build anything yourself.
All these (except ActiveState Python) are available at Sourceforge, or Google will point you in the right direction.