I have the newest update of EZKeys V1.2.3 (64 bit). I see that in the stand alone version you can save a project. That really doesn't help as I compose in the DAW using the plugin. I cannot find an option to save a project inside the plugin. I can only find the option to save a midi file or WAV file which is not the same as saving a project that like you mentioned, "saves the current expansion and the Song Track".
Am I missing something? Thanks for your help 