When scanning the library pmm should be able to create a collection if it finds multiple editions of a film. For example if your Library has:

Alien (1979) {edition-2003 Director's Cut}

Alien (1979) {edition-Theatrical}

Blade Runner (1982) {edition-Director's Cut}

Blade Runner (1982) {edition-Final Cut}

Dune (1984) {edition-Theatrical}

Dune (1984) {edition-Extended}

PMM should be able to create separate Alien, Blade Runner and Dune collections that contains just the multiple editions of that film.