Yes.. That is the way to go...
You can then regain control of the idling engine by pulling the stick back to idle for a second and then you have throttle control again. Does this sound like the right approach?
I would rather see this as a switchable feature so I could use it all the way thru full throttle..
In rudder controlled mode when the throttle is below the 1/5 point you can control the throttles of each engine with rudder input. i.e. full left rudder if left engine idle right engine full power. Half right rudder is right engine at idle left engine at half throttle. Once the stick is advanced above the 1/5 point this feature is disabled
Robby