To answer question number two:
The autobrakes "consumes" an extensive amount of hydraulic fluid to regulate the brakes to the desired level. Since the isolation/preservation of fluid only applies to the supply side of the brakes you might end up with a completely dry right system=no brakes if the leak is on the return side of the brakes..
If you are down to reserve brakes you really just want to do the one application, come to a full-stop and get towed away, unless you've just got pump failures and no leak, then I assume it's safe to use the autobrakes..