Tetra-WebBBS Support Forum
Some longer time ago the same thing came up as an idea. Maybe a bit different but basically the same.
The idea in detail:
Only admin can post new topics - aka the first, thread starting message. This is the page to be commented on later.
The index showing only these messages, with teasers on for a couple of topics.
(However, comments is OFF in that section of the site)
Each page showing the threadstarting message and all its "comments" - on one page.
(low volume section of the site, but you'll get the idea)
Those days I called it a "blogview" plugin for the forum software.
If you want to take a look and maybe post a comment, go here for an (mostly unused) blogview:
and the forum on the same site here:
Of course you're right, it's possible to use the software for more than just a forum. In fact I'm using it for almost everything on my sites which is supposed to collect user generated content (classified, news, reports, forum), regardless if it's only content as a single message (classified) or responses only (comments) or both.