Throttle cut vs throttle idle?

Hey Jeti users.

I have a DS16 transmitter, and am currently programming a plane with a gasoline engine.

I think I have misunderstood something about "throttle idle". I thought that when I activate the assigned throttle idle button, should the gas servo remain in a preset position, regardless of where I have the gas stick? A bit like "throttle cut", just for idling, not to turn off.

Hope someone can explain to me how it should work (if I'm totally wrong with it).

René.