I never heard that every bedroom needs a GFCI? In every new house that I've been in, they use normal breakers in the box, and then run the line to a GFCI outlet right next to the box and write on the faceplate where it's going. Most homes will have half a dozen of these all lined up. Bathrooms, kitchen, laundry and whatever else has a sink. Adding bedrooms will just add a few more GFCI outlets to it, so it's not a big deal, just something new that I never heard of before.
Wiring is pretty basic in a house. Size of wire determines how many amps you can run through it. If you run too much power through a wire that is too small, it gets hot. This is how electric heaters and electric stoves work. 14 gauge wire is the smallest you can use in a house and it's only good for 15 amps. To save money, some people run 14 gauge wire and a 15 amp breaker for their lights. I think it's a waste of time and money when you already have 12 gauge and a 20 amp breaker for each bedroom. So what if the light in that bedroom goes off if the breaker trips. How often does anybody overload a 20 amp breaker in a bedroom? It never happens. In the kitchen, it could happen all the time, but that's also why you run dedicated 20 amp lines to things like the microwave, garbage disposal, and refrigerator. Then split the kitchen outlets into two banks of 20 amp outlets so your good if you are using a toaster, blender and a coffee pot all at the same time.
Other then the kitchen, there really isn't any other room in the house that sucks up very much power.