This is what I have done:
Set a virtual button at the 1%-2% range of the throttle axis in VPC configuration software, and set this button as throttle OFF to IDLE(RAlt/RShift+Home) in DCS.
If you wish, you can use a modifier with this button, to make the throttle go IDLE to OFF.
EDIT: I have a CM2 with no detents. If you would like to couple with detents, you may set the virtual button exactly at the detent position.
Make sure to bind the controls in CPG bindings, not in Pilot. Even if you are in the front seat, the control settings page will default to pilot. That's a mistake I have made before.
Arendellecita's post in Power levers with physical throttle was marked as the answer