This keyboard is for FPS gamers. WASD is the staple key combination for these folk, and it does a wonderful job making these keys accessible. Nobody, but NOBODY who plays FPS games uses the arrow keys, and haven't since the era of DOOM.

The right hand side of the keyboard puts all the keys for typing under your fingers of one hand. Theoretically, this could increase typing speed by allowing faster typing of common repetitive letter combinations, like ee, oo, and ll.

As for the amount of keys depressed at once, i'd be surprised if they hadn't included a quality controller allowing for 5 or 6 at once.