Second: How well does it scale for developing large sites (for whatever value of "large" seems useful for discussion).
One of the things I really like about Ramaze is that I can start with basically a Rack app, spin it off to a simple Ramaze app, and keep expanding and refactoring it as requirements call for.
Is there some app size or level of app complexity beyond which Roda would not be a sensible choice? You say it has a plugin system; is it really battle-ready? (I'm going to guess Yes because of who wrote it, but I'd like to hear any additional thoughts on it.)
I get the impression that Roda lends itself to building large sites that are a collection of sub-sites or services; you're never really building a single big monolithic app.
Side note: For fast syntax highlighting you could use embedded gists.