Why can't I select previous region?

Hi!

I've just started playing around with BC. And it seems like a huge time-saver if I can get the batch commands I plan to create.

I'm gonna do a large voice-over project that requires several thousand files with specific names.
So my first batch command would be :
stop- select previous  region - rename

But my problem is, I can't type in this command:
Control+option+tab = select previous region

Thanks up front