I echo comments that you'll want the movable armrests to make it easier to strap in the carseat securely. The main benefit of the bulkhead isn't for you--it benefits the person in front of your child, whose recline will be severely restricted/eliminated on a CRJ if you install a reverse-facing carseat. That said, IMHO that's not your concern, as you are simply using the space the airline sold you in a fully FAA-approved manner.