I think it goes without saying that one of the primary tension on the board is between those who are sabermetrically inclined and those who are not. I'm sure this is true for the Sun Deck as well as ORG.
While certainly advanced stat conversations are useful and productive in the context of many discussions, often the discussion topic is derailed by a discussion on the appropriateness of a given measure.
I think it would behoove the site to have a special forum dedicated to sabermetric/advanced statistical analysis. It would allow for a stickied repository of definitions for 'basic' concepts like run scoring correlations (which Steel has posted ad naseum for good reason), VORP, etc. This would provide quick access to these discussions without the need to rehash them over and over again. It would also be a less cluttered place to post some of the great analysis being done by site members like WoY and Cyclone. Heck, we could even have "THE Adam Dunn Thread" rather than rehashing it over 15 pages once a week.
Lastly, it could be accessible to ALL site members, provided an appropriate level of intelligent discussion. This would allow ORG members more access to Sun Deck members in a specialized context. This has worked to great effect in the Minors forum, where discussion is free, but focused.
While I certainly appreciate the importance of maintaining a critical mass of activity in any given forum, and not spreading out discussion unnecessarily, I think this forum would add to the site, make some of this type of thinking more accessible, and cut down on a lot of the completely unnecessary, repetitive conversations that add clutter and detract from the RedsZone experience.