Aux 9 & 10 and are available on the expansion connectors and can be used directly for E-Throttle control without requiring an external E-Throttle unit.

More than three Analog inputs are available on the expansion connectors which can be used to add TPS (Sub) and the APS inputs.

The EVOLink (IV-VIII) plugin doesn't have an E-Throttle relay setup and the E-Throttle power is supplied from the same source as the ECU power so an Aux will need to be assigned as the E-Throttle Relay but will have no effect on the operation of the E-Throttle.