...Go to Configure -> Non-Xbox controller.
ControllerToKeys aims to give full controller support to all PC games that don't have it by emulating key strokes, mouse movement, mouse buttons, scroll wheel and key combos (i.e. alt+tab).
With the ability to save and sharing button mappings, the intention is to be able to publicly share your mappings with others via. the forums. Hopefully, one day every game will have have mapping.
Requires Java 7.