This is not really a request for passwordmaker. More hoping passwordmaker.org can push for standards to include fields in HTML forms (and xforms?) or a site-level file to indicate the features the particular site's passwords require/support. These fields or this file would be very much like an account entry in your RDF file.
This would allow utilities like passwordmaker to automatically configure for account creation or password generation.
In fact, if you just implement a check for an RDF at the current URL and at the root for the domain users could start integrating it into any sites they run and it could hopefully become a standard
So I guess this was a feature request after-all.