ConfirmEdit will always need to change captcha solutions as the landscape of bots and vandals changes. To aid the implementation of new CAPTCHA technologies, we should strive to have documentation and/or an example of a provider implementation, noting key areas where customisation is likely to be needed, and key pitfalls.

As it stands, there's no real documentation on MediaWiki.org for this, and code comments on some classes are generic and/or lacking.