Could we have a "Smoking Room".
Literally anything goes, discussion wise. If you don't like it, don't go in.
Obviously with an appropriate warning on the front door. Something along the lines of - "This section is not fully moderated, members may post any comments they want and no action will be taken. If you are not willing to take part in unfettered discussions please do not enter this section."
Other than discussions it would be subject to the normal rules, e.g. no links to porn sites, no links to warez etc.