Thanks! :D I haven't used the Export/Import Options yet, but I'm sure they're super useful, especially if collaborating with others.
I actually created the feature after GMTK jam, because during the jam I found it frustrating when I had to export several builds and reselect all of the configuration options manually each time.
Oh, and by the way, if you use the same project file (name/path), the packager will remember the last options you used. :)