Greetings. Im pretty sure this isnt exactly what youre looking for, but sktools csn make cabs in limited fashion. You can turn registry files into cab files, or make a cab from an app already installed on your device via an exe file through active sync. So far ive created a cab for every app that i could only previously install through active sync.
i apologize if youre looking for something more indepth and with more function, but i thought id throw this out there anyway
dschoenike