You're in the heat of the battle. Trying to get your circle-strafe on and take out the other guy before he realizes you're there. And then thunk your mouse cracks into the right side of your keyboard. If only that blasted 10-key numeric pad wasn't there!
With Asus' ROG Claymore keyboard, it doesn't have to be.
Sure, it has all the usual high-end gamer keyboard features. Cherry mechanical switches, LED lights that provide up to 16.7 million colors, blah blah blah. But it's best trick is that you can snap off the number pad and snap it back on the left side, giving you a little more room to mouse around.
There's some synergy with Asus' Republic of Gamers motherboards, too. If you happen to have an ROG brand motherboard, you can use hotkeys on the keyboard to hop into the BIOS settings, overlock the CPU, or overclock the RAM.