[scpedicini]

Wow, hard disagree. From a discoverability perspective, enter has the dictionary definition of "to go in to something" as in to enter a building for example, or in this instance to "enter" a file. Furthermore, single key shortcuts should be reserved for more frequent actions, eg enter vs Cmd-O. Enter as rename is not only unintuitive, but it's also an action which is performed less often than opening files.