As much as I hate to break things once people have gotten used to doing them a certain way, there's a keyboard inconsistency in the code editor while running under OS X that really messed with me early on, and continues to do so here and there.

fn+left/right - takes you to the very beginning or very end of a line
fn+up/down - instead of taking you to the beginning/end of the document, results only in page up/down

command+left/right - takes you to the next symbol/token/whatever.
command+up/down - instead of page up/down (what I would expect), takes you to beginning/end of document

It seems to me that the command key should control the shorter movements, while fn should be reserved for the extreme beginning/end jumps.