From the perspective of a developer, I think the improvement of the documentation is a worthy goal. It's always the last thing on the radar and for an open-source project that just ins't feasible. I think the quality of the documentation and the happiness of the developers are directly correlated. On the surface, I like the idea of integrating the documentation into Mediawiki — maybe a set of docs about the version that you have installed. This gets tricky for updates, though, and I'm sure people will complain that they aren't looking at the most up-to-date version. Even if it's not built-in (and only accessible from the MW-hosted site,) improving the infrastructure to include the JavaScript libraries would be a major win.
I think this all boils down to:
- improving the in-line documentation in the code
- working on a solution where this documentation is parsed and displayed to the user in a good way (like the doxygen results)
This project has my full support and I'm willing to work on this, as long as somebody else oversees it (I've got enough going on at work.)