What year is your car? The malfunction of the seat belt presenter is, in my opinion, a blessing. When the other side quits you will be very fortunate indeed. Just reach down low to grab the belt and pull it up. Passengers can be trained to do the same. No, the windows don't open and close slightly when the door is shut - again a blessing unavailable on later models. The cold start problem could be bad injectors, bad fuel pressure regulator. Tell us more about the symptoms. Does it run rough for a while when it starts?