All files included in the install (including files that belong to packages) will be removed during uninstall. This means that you do not need to do anything extra to get a package installer to be uninstalled.
I have always really liked Setup Factory, but this time, you guys have really out-done yourselfs. This program is GREAT!
Granted it is taking me a while to get used to the new scripting language, but it's worth it. :yes