I'm not sure exactly what you mean, mainly because I think all the SSGs can do it. I tried Lektor recently, and I don't see why you shouldn't be able to do exactly this. It's not even hard (unless I'm missing something).
EDIT: Maybe what I'm missing is that other SSGs are very opinionated, while Lektor is not.
Sort of a "magazine theme" or a "newspaper theme" for a SSG.