I have noticed that given how much I identify as a rationalist, how much I have in common with the community here, how important I consider it, etc. I have surprisingly little instant in group identification with community members compared to other online communities. There seem to be an aspect of social involvement that LW does bad at. And there is one thing lacking that to me seems the obvious first suspect; the lack of of-topic unstructured chatter.
What I do when I feel that I identify with some continuity online is in fact not usually the thing the community is ABOUT. Instead, it's the things that grow out of the sides; forum games, members art projects, photo share threads, fanworks. I can speculate on why this happens this is so, but it dosn't seem very useful at the moment, I'm not highly confident on any specific theory, and most will probably find it fairly obvious anyway.
LW, however, has no real room for this. Even in the discussion section, things that are not reasonably on topic will be punished with negative karma. Now, this is obviously needed, but one must still recognize there IS a prise to being so structured and focused on a single goal when humans naturally tend not to be. Look for third options.
Now, I have a specific solution in mind, but I'm going to hold of on proposing it and see if you come up with something better before I post my idea.
EDIT: My suggestion has now been added in the comments, please check it out.
Well, sure, if you're just talking about the karma aspect.
Re. overall suggestion, you seem to have suggested another discussion board as a "catch-all" dumping ground for off-topic replies. I suggested that there's probably some "canned" package that could be implemented like a user's forum.
It comes down to whether separate forum areas would be helpful or not. If it's "just another discussion board" with the rules you stipulated... sure, that works.
If you like the separate areas and like the functionality of a forum, then I find it odd that you would criticize an mere suggestion to give it the karma functionality you proposed, while at the same time adding quite a few more features that might improve the user's experience.
If you don't like the forum idea in general, then just say so and you don't have to worry about discussing the sub-topic of it's karma integration since the whole package is moot. If you do... then we need to brainstorm a way to implement karma support and I have gotten the ball rolling :)
Ok, point. I don't really think there'd be enough traffic to justify several sections, but I could be wrong. Your suggestion still need more gardening solutions thou.