You can always use a keyboard remapper if there isn't an ingame way.
http://webpages.charter.net/krumsick/
You can use that to remap wsad to the arrow keys (requires a restart to get things back to normal though... and remember you may need certain keys to put in your login password). I'm currently using that utility to remap the numpad - (since that key is doubled up elsewhere on the keyboard) to my left alt since for some reason my keyboard's left alt key isn't working. So I can verify that program works and isn't a virus.
Fair enough if that's too much effort though.