You should probably post this on a BMX message board that riders actually frequent. There's only ten or so people that actually ride BMX here. Try BikeGuide or *sigh* BMX-Forum.

1. It's different because they actually offer a comfortable helmet, except you can't buy it in California.
2. Everything available in California is incredibly uncomfortable.
3. No.
4. Open-face helmets with visors and chinstraps, hopefully.
5. Fitted hats with forcefields.