docking mode? seriously? are you going to tell us you go to a beer-drinking contest wearing only pink women's underwear?
i would use 2 engines as i would suppose everyone who might respond to your thread would probably also advise. one engine would provide asymmetric thrust. how would that help you? when i dock, i just cycle the forward/reverse lever back and forth to attain a low speed i am comfortable with. i also use differential thrust to swing the boat around as i need to in a crosswind or stiff current.
didn't you already ask this question? i feel like it is a good idea to buy a boat commensurate with your level of experience. several years ago, there was a football player named thruman munson. he died in citationjet crash while trying to practice landings for his private pilot license. normal people with common sense start out in a single engine cessna instead of a high performance jet. there is a lesson to be learned here. your 510hp boat can kill you and your loved ones..