Not sure, until I've got something more concrete than just measuring pedals I've not spoken with them. I'd imagine they'd treat it in the same way as they would if I'd mounted that second throttle pedal that someone linked earlier, or modified the car for hand controls due to a morphological requirement.
Just a thought, but rather than modifying the pedals, could you modify the footwell - e.g. have an adaptor plate made up that attaches where the pedals normally sit, onto which new pedal attachments are fixed for your desired position?
Not sure, until I've got something more concrete than just measuring pedals I've not spoken with them. I'd imagine they'd treat it in the same way as they would if I'd mounted that second throttle pedal that someone linked earlier, or modified the car for hand controls due to a morphological requirement.