about cutting corner it is almost a certainty if it was a new construction speculative house. All builders dictate to the heating contractor what they will pay for a floor plan and the contractor has to see how he can do it and still make money so corners are allways cut.
This does not mean that the system will not operate adequeatly but not as efficiently and as good as it could with the proper design.
Depending on the county or city building code, most duct system are required to have balancing dampers on each outlet you may partially close the ones near the furnace fan (or the ones going to room that are hotter than your bedroom) and force the air to the other parts of the house if the contractor was not required or did not install them, you can still regulate them by partially closing the supply air register accomplishing the same thing.
All reputable contractor will try and adjust the airflow in the house to achive a comfortable level in the whole house.