I can think of some good reasons, but they would be more suited to a very large throttle body.
You could have non-linear throttle response, you could setup the throttle position to correspond to engine torque, use it as a idle control (though a bypass would probably be easier), use as another point in your immobilizer, set it up as a launch control, etc, etc.
Go for it, if nothing else you have given a project a go and learnt something new.