Peter,
I agree. I can't offer any suggestions for the technology side of the question.
I do offer this. Given the site is primarily for fishing and hunting enthusiasts, and given the site's "image (way folks precieve those who contribute here)" is improtant to the feasibility of the site, I think it's a good idea to have Off-Topics be a "members only area".
Candidly, and I take my share of the blame, most of the comments there, and topics discussed, do little to further the image of the site as supporting the angler and hunter who seeks information about those endeavors.
To view it another way, casual vistors to the site gain insights and information about hunting and fishing, and once they see the benefit, and visit more frequently, they generate hits on the server that are good for the site. Once they see the benefit of the site and elect a more formal, participation type relationship with the site thru membership, then they would get the additional "benefit", of the Off-Topics site.
I agree Off-Topice ought be for members only.