There's a thread on here that contains a link to a discussion of this concept by renowned herpers. I will have to look through posts and find it. Essentially the gist of the discussion was that the sole purpose of using all the available heating elements we have at our disposal is to help the snake achieve the correct body temperature of around 81-83 degrees I believe. The person interviewed maintains that all normal physiological functioning of the reptile can proceed at the previously stated temps. Giving hot spots around 90 degrees essentially acts as a heat sink that the animal can go on and off of in order to pull heat from, and achieve the desired temperature. Therefore, if you can maintain the entire reptile room at the correct temperature, there is no need for the animal to need to choose between warmer or colders areas of the cage, as they are constantly at the correct physiological temp.
With regards to breeding I feel like it would work out well, and might not necessitate dropping temps to induce breeding. I spoke with people from Boaphile many years ago, and they claimed that all their in house breeding boas are kept at a constant 82 degrees, and are obviously flourishing and breeding.