Cannot see a problem with using full reverse wet or dry runway on remaining engine since there is no warning in the FCOM against it. Using idle reverse or worse still no reverse is going to give hot brakes. The FCTM covers the subject well. The use of minimum reverse thrust as compared to maximum reverse thrust can double the brake energy requirements and result in temperatures much higher than normal. Brake fires are not pretty to watch and most undesirable from passenger comfort point of view.
