This is the perspective of an occasional user who shows up in spurts. So take it for what it's worth.
The identity of this forum in my mind is Q. If I want to know something about Q, I come here because if it isn't here already, someone will know.
If I want to ask a question about my Subaru, I go to a Subaru forum. I talk college sports on a college sports forum. When I want to see lame political diatribes, or pictures of grumpy cat, I go to Facebook.
There's certainly nothing wrong with having collateral discussions. But you have to be careful not to lose sight of what makes this forum incredible: lots of users of ever experience level, each happy to share their knowledge about Q, (usually) without getting into stupid arguments over stupid things. That is exceptionally unusual in an online forum with so many people who know what they're talking about in one place.
If this forum got too cluttered with things other than BBQ, it would to lose at least some of its appeal for me. In my view, that is this board's identity, which is probably pretty close to what Martin said regarding a sense of community. -He hit the nail on the head with that comment too, BTW.
Personally, I think that to the extent the mods pursue this option, it should be kept in the corner. It should be easy enough to find for people who want to go there, but not a prominent feature because that poses the risk of losing focus on what has made this forum great IMO.
Like I said, take it for what it's worth.