Johnathan,
You already have that feature on the Tyros MFD--it's called favorites. And, you can customize the Favorites list and MFD using Michael Bedesem's Music Finder View program, or just build the list on the keyboard.
First of all... it should be easy to do in the keyboard instead of being done in a separate software solution. Does it put it in the order you want or is it alphabetical? Do you have to rename the songs with numbers i.e. 01-02-03??