Why Can't Safari AutoFill The Google+ Password

As increasingly many of us, I'm not a fan of keeping cookies as well as entering usernames and passwords manually. That's why the "Ultimate Cookie Managerfor Safari", as well as "Allow AutoFill even for websites that request passwords not be saved" setting becomes increasingly useful.

Unfortunately the AutoFill doesn't work with Google+ as well as a few other sites. When in fact Google is the number one site that lead me to such a browse style.. Basically I often login to Google services, yet I don't want them to trace my *** all around the web.

To cut to the chase: Is there a way to AutoFill the Google+ username/password or anything I can do.

Cheers.