There are two ways to rename a file in the Finder which is already selected - press return, or click on it again, then wait a second. I find that the second option leads to a lot of unintentionally renamed files. The problem is, I might click the file when it is already selected to get focus on that window, then hit spacebar to bring it up in quickview. Unbeknownst to me (since it is behind the quickview popup dialog), the Finder has switched to rename mode. When I hit the spacebar again (to close the quickview), nothing happens, because in the background the file is in the process of being renamed to " ". Any action I take from here to get rid of the quickview dialog will commit the rename. I probably will not know for some time until I wonder either what happened to that file or why I have a file with named " .pdf".
So, is there a way to turn off this troublesome "feature" and stick with just the return key to rename?