This might need to be a feature of your "Professional" version, but it would be nice to be able to read in an MSI and then create another one based on the one that was just read in. Maybe force the program to save it to a different name/location so you won't overwrite the one that is there. Maybe even have the ability to do the same with some other installation packages.
Since I'm just now starting to even dabble in this kind of thing, I don't know what technical/legal hurdles there would be to overcome.