I would be in favour of questions being submitted by anyone and placed by editors.

Since this will be a moderated forum, the editor should be able to edit the questions submitted. This will probably mean that it will be similar to a question proposed by a user, but may have a different name or be rewritten to be more general; for this reason, I wouldn't bother crediting a question to a particular user as such.

As to who can post answers and who owns them, I would be in favour of allowing anyone to post a reply. I have learned a lot about perl on this site. Some of the best things I have learned on this site have been from extended exchanges between various people.

It is even useful to have wrong answers posted. These are useful because someone else will point out the mistake, which may be quite subtle and easily missed if you are not familar with the topic. Seeing where others have gone wrong and exactly what was wrong with it gives a deeper understanding.

I think that (if the editors are prepared to do it) once a question has been in place for say a week, an editor will create a synopsis of the posts made, which should go in as the first reply. I would make it owned by all the editors as a group if that is possible.

Nuance

Baldrick, you wouldn't see a subtle plan if it painted itself purple and danced naked on top of a harpsichord, singing "Subtle plans are here again!"