Hi, I agree this is a problem, but there is one fix (perhaps you are already aware of this).
If you have a few files to rename, and you plan to rename files manually anyway, then please right-click the file and go to Properties. Do the renaming from within the Properties dialog box.
If you have multiple files to rename, then you might probably have to use PowerShell (if there is a pattern to your renaming) or some other method.
I just try and beat it speed wise using F2 and usually left then spacebar. Laughable that Microsoft haven't been able to fix it yet.