F2 - Rename
Strictly this is a RefactorPro shortcut as the Rename functionality is for RefactorPro. (However since RefactorPro is included in the Price of CodeRush that should not be an issue)
It is also, I think, Disabled by default.
You should be able to use the DevExpress\Options...\IDE\Shortcuts screen to search for F2 and re-enable it.
Very natural to rename Vars and Methods using F2 when you're already used to F2 functionality for Files and Folders in Explorer.