Just a note; the 'validation' feature will most likely not be turned on on en.wikipedia.org when we upgrade, since it's not currently in a usable state.
Problems include, but are not limited to:
* In various places it tries to load metadata for *every* revision of the page. This would be fatal on the actual Wikipedia, where there are pages with tens of thousands of revisions. There are likely other severe performance and scalability issues with it.
* The 'management' interface for defining survey options is not locked off properly, and is very hard to use if you do get to it.
* Lack of HTML-safety on the UI interface: as a quick hack I added htmlspecialchars() guards, but things really should be changed to use wikitext where appropriate; several of the UI messages are currently displaying raw HTML tags.
If anybody would like to work on it further that would be spiffy; otherwise it will remain in limbo indefinitely.
-- brion vibber (brion @ pobox.com)