Yah when i first moved to mostly playing on PC I had the same issue where my hand kept moving off the WASD setup and i'd end up tossing grenades with the E key or something. It's a perfect spot to use though, once you get used to it. Shift, Tab, Ctrl, Alt, and the Q and E keys right next to it for quick actions and the whole thing is placed right at the beginning of the numeric keys that run across the top of the keyboard. So once you get used to it, it makes a lot of sense for it to be there.