hey WAHa, me again.
you know the more formats the better even if it means more hard work for you, right? =) kidding of course, your work is most appreciated and i recommend it to everyone i know.
do you think is it worth to support the 'pkg' and 'mpkg' format for those pesky mac packages which go through a bunch of dialogs and ask you for the admin password just to move an app to the app folder?
this guy in the link below, released "unpkg" which does that. it's a python script (source included inside the app>contents>resources as seen in the readme), so it must be a pretty easy task, no? not sure how easy i it to call a python script, really.
best to you, man.