If the seafood is if good quality, I'm a bit of a purist. I like to taste what I am eating, not what I dumped on what I'm eating. Yes, some spices and/or juices can enhance a flavor, but many are misused and end up covering up what you are making. If I am going to eat lobster, I want to taste mainly lobster.
So, for lobster, I like a little sprinkle of black pepper and I have always preferred lime over lemon (for all seafood). The juice from one wedge squirted in a line right down the middle of diced lobster with a little black pepper gets it done. No bread, thank you. Butter all depends. If it is very fresh lobster, it usually is not "fishy" tasting so the butter is not needed.
Probably not a proper lobster roll though..... just how I like it when there is some meat leftover.