Gene, what I did with my RD8000 (same basic radio function) was set up the throttle as you would any other. On the low end, set the trim so you are about mid point with room on both the up and down trim. Just remember that this is the center point. This way, you can do what you wish and, once you get the engine running and the idle set ( mid trim), then you can set the throttle cut button and the amount of throw you want to assign to cut the throttle.

The mid trim allows you some slack for adjusting the trim and also allows you to use the throttle cut button to cut the throttle. It comes down to setting up the thing according to your flying style, setting up your idle point and RPM, then flying.

CGr.