Aren't thrust levers "just a decoration" on any FADEC-equipped aircraft?
Perhaps on Airbus, but not on Boeing.
On ALL Boeing FADEC-equipped, the thrust command is directly linked to the throttle position. Baring some sort of mechanical failure that would prevent the engine from responding, on a Boeing if you set the throttle at idle, you'll get idle. Set the throttle at part power, and you'll get part power, set high power, well, you know... On Boeing, there is no aircraft computer between the throttle and the FADEC - it's a basic design philosophy.