Nermander, I've no idea why it was removed but your suggestion sounds about right.
However, not putting something else in its place doesn't give users much confidence in how their problems are handled.
If an email registration path - as there is for the Wiki - was introduced it might help people to report problems and feel less frustrated.
But there's always the argument that problems should be discussed on the forum first and then, when there's a consensus about what the problem actually is - if there is actually a problem - a more complete bug report can be compiled.
Having done some help desk duty in my past I can recommend this option but I'm sure others will argue against it and their reasoning will be sound. It should really depend on what the developers want but most of them probably don't read this forum.
The link on
http://wiki.scribus.net/canvas/How_to_file_a_bug_report just takes you to the Mantic home page. I'd say the page needs to be changed until something is done about all this but any change needs to be made "officially" by someone in authority.