As everyone already has said, the APU would help out in some rare instances when you may potentially have a problem... It is ultimately up to the crew to determine their need for an extra generator, bleed, etc. All that FlyChicaga is tring to teach in his program is the use of CRM techniques and prioritizing the workload at a critical phase of flight. We are taught many things in the sim... most of it we will use on a regular basis, and others we will never see again in our flying careers. Remember, the sim is a tool to teach not only to fly an airplane, but to also teach the mental aspects of dealing with problems. Any of you remember reading about a short circuit in a part of the electrical system in your systems manual? Well, how often have you come across that as well?? That doesn't mean it'll never happen, but it isn't a daily/weekly or even a yearly occurence.
Sloth
Sloth