Here's what UAL does:
F/O minimums only allow for approach to CAT I minimums to be flown by F/Os.
On all autolands the Captain is the flying pilot, no matter what the actual weather/ visiblilty.
A little correction to what Young Paul said:
The A320 , during autoland, actually automatically reduces thrust to idle, but the pilot is required to move the throttle levers to the idle position, because the levers don't move automatically on the Airbus.
If you leave them in the CL detent( where they usually are in this situation) , you will get idle thrust but the spoilers won't extend and the autobrakes therefore won't work either.