Need an ambidextrous option
And for those who say lefties would use the arrow keys are wrong - ijkl would be similar to wasd or esdf but very much for lefties. Heck, even the numpad keys would be better for lefties. The whole point not to use the arrow keys for any non-brainless game is the fact that you have so many more controls to map to multiple keys other than forwards, backwards and strafe.
Ever since Tribes (besides the standard movement controls you had...zoom, cycle zoom level, use pack, toggle viewing perspective, throw grenade, throw mine, use beacon, use health kit, jump/ski, suicide, drop pack, drop weapon, drop ammo, drop flag, drop grenades, drop mines, drop health kit, free look, command circuit, task list - and I could keep going...) there was never any consideration of using the arrow keys - and besides, the arrow keys aren't even comfortable to use for righties without repositioning the keyboard...
Heck, the keyboard as a whole is a major weak link in gaming control - its only plus would be the sheer number of keys available to bind controls to, it certainly does not give you the precision that a mouse or analog stick/trigger/button on a console controller does. And if you're still using the arrow keys for any reasonably advanced game you are putting yourself at the disadvantage by disregarding the keyboard's only strength - the vast number of keys. If you can still kick ass using arrow keys I wouldn't necessarily call you a noob, but I would question how much more ass you could be kicking if you didn't actually hinder your own potential by refusing to adopt a superior control scheme.