Oh, man, zucchini bread! ♥ Not really savoury, though.

Not quite a "filled roll", but when I hear bread + lunch I start thinking about those soft pretzel-bun things that make such great hot ham-n-cheese sandwiches; wish I could buy those where I live. D: Pretzels in general might be a good thing to include; they make a great snack or (scaled up) a great bread product that can be dipped into a variety of sauces (people like customising, right?) and they can have sweet variants, too.