One Lever is a great function if you have a twin installation. It's much easier to throttle in high seas.
The throttle only function is a great safety tool. Be sure to press the "throttle only" button when to leave the helm. If any of your passengers are unfortunate and gives throttle, the engines will not go into gear. Only rev the engines.
Docking mode is not something that we use in the Goldfish Team. It reduces your engine power in port. We say; let us decide how much power that's necessary. Judge for your self.