flamingweasel mentioned that the controls are unconfigurable, but this isn't quite correct. While there is no config in the game itself, you can change the keys with a little effort.

Buried in the data files is a config file, similar to Quake's config files, where you'll find a list of key bindings. It goes something like this:

...
bind w moveforward
bind s movebackward
bind a turnleft
bind d turnright
...


The things the keys are bound to are just an example, and probably not what actually appears in the config file, but they should be similar. To change the keys, just change the token that appears after 'bind'.