Car moves when left in gear?? holy moly. I almost never use the handbrake, unless on a hill. And even then i dont overdo it, 2 clicks is plenty for a small slope. Keeping it in 1st gear or Reverse gear is enough for me most of the time.
It was never that bad for me. I could start normally, but i would hear a "THUMP" and feel a little withhold, but nothing like your experience.The N can be very sticky! Mine was so stuck, it looked like the handbrake was still fully on. Floored it forwards, backwards, no freaking movement. It really took a couple attempts with some decent power before it broke free!