To be honest, I've never seen anyone complain about the use of American or Queen's English, I have seen people complain about the usage of 'ghetto' English or shorthand, although it hasn't been that big of an issue thankfully.
As it stands, we should *not* restrict people from using the Queen's English since we do have European members, but the recommended language should be American English. That's my say on the matter, thus Zack if you do make the change, make it to where American English is recommended, but that the Queen's Language is permitted.