How do I change the controls/key bindings on Don't Starve? I can't play using the WASD keys.
Don't Starve is mostly controlled by mouse. You are only able to walk around using the WASD keys.
Please see below, for reference.
Alternatively, you could use AutoHotKey.
Probably wasn't available when question was asked:
From Main Menu, go to Options, Pick Controls, and you can set custom keys.