Good question. Websecurify is more than it seems. A lot of code has
bee put into place to make extension development a breeze. It is
actually quite easy for you add new exploits or whatever you fancy
under this menu and also easily integrated with the reports. For
example if the scanner encounters a SQL injection you can easily add
an exploit module to take advantage of the vulnerability. The built-in
exploit modules will come in future versions although there are
already a few private modules that can take advantage of SQL, XSS and
CSRF issues.
As for the documentation, it will be coming together around version
1.0 when the tool will be quite standardised. We are also thinking to
open an addon-ons network to all developers like you to post your
extensions so others can use them.
In summary, many exciting things are on their way and will materialise
very soon.