You can do the same on the 340, by the way. I have never needed it on that plane, but it is an option. On the 320, if you read the procedures, after selecting CONF FULL it says that you should retract the speed brakes before selecting CONF FULL because they will automatically retract, causing a pitch down. That note is not applicable for the 330/340.
Now, do you fly any of those planes?
Cheers!