Missy-Q wouldn't be allowed in scrabble anyway if you're playing to proper rules, English is anything starting with a lower case letter in the Chambers dictionary, American is a compilation of about 5 dictionaries, none of which are the OED, excluding "offensive words". International games are a combination of the two.
I had a brief obsession with the game a while ago despite my spelling being on a par with a five year old.
Further reading on the subject - "Word Freak" by Stefan Fatsis, but be warned, if you read it you'll feel inadequate every time you play!