Ok, step back a bit... I have a file selected, I have a key called 'enter' - if I press 'enter' what would you expect to happen? I'd expect to 'enter' the file - by opening it or 'entering' the file. I wouldn't expect it to 'enter a new name', because that's an editing function.
Now, my mac has enter marked as 'return'. Let's follow the same logic, assume I have a file selected, what should 'return' on a file do? Return it to where?