Just had a peek at my trusty Boeing 737-300 FCTM and at page 5.33 is says "set the MDA (H) using the baro minimums selector...if required to use MDA (H) for the approach minimum altitude, the barometric minimums selector should be set at MDA + 50 feet to ensure that if a missed approach is initiated, descent below MDA(H) does not occur during the missed approach.
So for Pistol Pete - I guess if your ops people say they have never heard of this 50 feet addition it maybe they either haven't read the advice in their Boeing FCTM or they ignore it. Could be their local culture of course. Of course they may be operating another type where the automatics are so advanced, the 50 feet additive is not a factor?