Most of the time, I'm happy to accept the spelling corrections iPhone provides... especially when it inserts apostrophies (e.g. wont -> won't). But, having the spacebar be the signal to accept a correction is awkward... especially when what I've typed is correct. Then I have to go back and undo the changes... well, you all know what I mean. Is there some optional key to tell it, "no, don't change it... my spelling is correct"?