my task is, to create a forum-like behaviour which resembles StackExchange's platform with the only difference that only the question's poster will be able to comment on the replies.
My thought is to create a Content Type that describes the initial post/question, and then add a "Reply to this" button that should somehow create a new node of type "Reply" or something (ideally in the front-end, but that's another story - feel free to comment on it though) that should get automatically referenced to the initial post/question.
The "Reply" Content Type should maybe support Drupal's core comment functionality but restricted somehow to the initial post/question's creator.
The basic question is the automatic referencing. Other than that if you got any idea about the front-end content creation and/or the limitation of comments to the afforementioned role and CT, I'd be glad to get some extra input :)
EDIT: using Entity Reference module, not Node Reference module, fyi.