Since the FC5->FC6 switch from a backend of Mozilla to Firefox, Epiphany no longer prompts for which username to enter on a login page. (Multiple logins for one page must be saved to test this.)
Are we talking about upstream http://bugzilla.gnome.org/show_bug.cgi?id=472655, which is https://bugzilla.mozilla.org/show_bug.cgi?id=226735 ? Or are we talking about http://bugzilla.gnome.org/show_bug.cgi?id=166172 ??? I guess, it is not very clear what exactly is your problem. You know, that form which you get when filing the bug and which you immediately deleted, is pretty useful...
I don't use guided bug entry. Please don't be so arrogant. Closing since I no longer use epiphany.