Munki is fairly good at recognizing things for import. If you have a .dmg with a .app inside, it will, by default, make it so the .app gets copied to the /Applications folder. If you have a .dmg with a .pkg, it will know to run the .pkg to install the item. If you have a .pkg by itself, same deal. If you have a .mobileconfig file, it will import that as a profile.
But sometimes developers decide they want to make an installer.app, which is a bit annoying to deal with, because users (and Mac admins) typically have no idea what the installer.app does.
Scratch 2 Offline Editor has one of these installer.app files inside of its downloadable .dmg called Install Scratch 2.app.
Oddly enough, it doesn't seem to need to run at all in order for Scratch 2 to be usable. All you have to do is copy the Scratch 2 folder inside and rename with an .app extension, and then that launches just fine.
/usr/local/munki/munkiimport ~/Downloads/Scratch\ 2.app
I created Scratch 2 AutoPkg recipes for .download and .munki to automate the process.