A board for handball?

Why is there a separate board for something not within the laws of the game?

This is handball:
http://www.youtube.com/watch?v=jxw1-Id91lQ&feature=related

As is this:
http://www.youtube.com/watch?v=DbbsytHDp2o

And this:
http://www.youtube.com/watch?v=KaLREc3yVes

And this:
http://www.youtube.com/watch?v=NUWZuioV_DY



WHY DO WE HAVE A BOARD FOR THEM? Call me ignorant but can we not just integrate this into the football board?