Interesting idea and we do already have a concept of a movie id in our database. However our problem isn’t as complicated as the one you mention.

Most of the times, it’s a missing ‘The’ or the use & instead of ‘and’. The titles we’ve remapped are generally the same. Including all the different names of a movie is an interesting idea. If you have a chance, please make that suggestion over at UserVoice

like:
“The Lord of the Rings: The Fellowship of the Ring” (US-Name)
“Herr der Ringe: Die Gefährten” (German name)

That way, it would also get more easy for people to find a trailer/clip for a movie, that might have a totally diffenrent Name, that might mislead some People just like:
“Nim’s Island”
“Die Insel der Abenteuer” (german Name, means: “The Island of Adventures”)
http://www.imdb.com/title/tt0410377/

or one of my old Favorites:
“*batteries not included”
“*Das Wunder in der 8. Strasse” (german Name, means “*The Wonder of the 8th Street”)

or annother Favorite:
“SHORT CIRCUIT” + “SHORT CIRCUIT 2”
“Nummer 5 lebt” + “NR.5 GIBT NICHT AUF” (meaning: “Number 5 lives” + “Nr.5 doesn’t give up”)

Since I’m visiting the page from germany, I use examples, that I do know well.