I'd rather use a code generator at this point that spits out code according to the official API, vs adding an additional 3rd party API that tries to cover all these areas. Reason being is that it adds an additional API to learn. So far the track record of these solutions isn't overwhelming, they all tend to get stale (right?). And I know it's very minor and trivial, but it looks like the naming conventions don't follow the recommendations set out by the PHP coding standards page.

Or, like Chip said, something that can land in core at some point that helps to make common operations easier. The post meta api is already getting worked on by a fantastic group, it seems like a lot of things that will come out of that could be used across these other settings areas. Maybe Benjamin should join them?