Steering wheel paddles to change direction?

[machaqueso]

I configured my steering wheel's paddles to change gears (I have a G27), however the paddles don't seem to have any effect when trying to change between D, N and R gears on vehicles automatic transmission which is something every other driving simulator I have supports.

Is there a way to configure the controls so my steering wheel's paddles can switch through all available gears forward, neutral and reverse? If so, can someone please post instructions?