But this is a little different. I'm not a huge fan of the "knowledge base" monicker, mostly because it's been used so much, but I totally see what you mean about topics that are more like "how to" topics. There might be a place for those in our system. Screencasts, walkthroughs, etc.
One person here in the office (devil's advocate!) pointed out: conversation systems and documents that change over time with updates may not be the best match. But, perhaps we're not really talking about a conversation-like topic -- just a way to distinguish content differently, or simply put reference documents on our site that are "attached" to conversations.