Yes! Just a baseline certification of the Codex/API, theme and plugin development. There are a LOT of devs out there that don't really know enough (or don't know what they don't know). If there was some sort of study guide (i.e. a quick sheet like an infographic that describes the important sections on the test) that would help devs focus in on the most important skills they need to learn.

I know that for me, I get intimidated looking at all the tutorials and the codex for WP. I know I can learn it but I never know where to start and what direction to go. I understand that there is a "Getting Started" area, but I'm way past that and yet I seem to get lost in the more advanced areas. It's not about understanding the material, it's more that I'm not sure what is the most important info and I don't really know what I need to learn first in order to move on to the next area. I hope that makes sense.

A test with a study guide that provides a "Learn This then Learn That" type of set up would be helpful for someone like me. It's kind of already set up that way but what I'm referring to is almost like an infographic (for lack of a better example) that shows a map of how to learn WP. This certification is not just good for displaying a cert on one's site. It's good for helping devs focus on the most important elements of WP.