So if I have a file called: test.txt and I want to rename it, there are two options (depending on the Show already known file extension option):

1) ON: it selects everything (test.txt), meaning I have to manually select "test" and replace it with the new filename. (which is irritating)

2) OFF:
Only "test" is editable (and visible).

Problem is that I frequently need to change the file extension of a file, but if the option is turned on, it's a pain to change the file name.

I know that in Win7 it does something smart: It only selects the file name when you press rename[F2], but also lets you edit the file extension.

Is there a way to accomplish this?