My original idea was that if I write an article in response to a Forum question, I want to link the article back to the original forum question. The data structures are already there, I just want to be able to update an existing (unfilled) field.
Your idea (which I really like because it continues to blur the line between the two products in the process of enabling more collaboration) might be harder (and riskier) to implement. I'm expecting that the next ActiveModules release will significantly alter its own data model. In other words, I wouldn't want Engage to put a lot of work into a new feature, and then have ActiveForums come out with their next release and break that new feature. Just a thought...I'll let Chris make his own decisions, of course!