We are NOT talking about Normal or Alternate Law but the response rate of the controls with relation to sidestick deflection. F3 will give more roll response (ie bigger rate) with the same sidestick input than will Ffull. This came to light after an incident on one of our minibusses many years ago.
Erm... methinks that alternate/direct refers only to pitch law. If you get alternate law in pitch, your roll goes into direct, so no more roll rate demand and aileron deflection is (gaaaasp) directly proportional to sidestick deflection. So if you´re in altn/dir law no change to roll response when you switch configs. Well, on A320 anyway.
It seems there´s not much difference between config 3 and full on landing. But that is in sim. I still have zero hours on the real thing.