I may not be a mod here, but I'm a current mod elsewhere and have roughly 12-13 years of moderating and administration experience under my belt. My résumé includes large and small forums and wikis, with tech admin experience both past and present. That said, I'm going to offer my mod opinion. Having a complicated rule with various degrees and conditions that serve to intimidate and confuse new readers, while muddling up veteran users and even confusing the rest of the staff to the point that they have to discuss the rules they created with other staff will not work. I tell you this from experience. If the rules are simple and easy to follow, without all the little bits of fine print, then you will have far less hassle. It's okay to have a blanket policy. This is where administrative autonomy comes into play. If you—as a mod—feel that a user had crossed the line, then you are within your right to enforce policy and correct them. This includes rescinding on a previously-blanket policy. If a user takes advantage of a blanket policy regarding the permission of linking and mentioning fics in a discussion topic, and they exploit that to repeatedly plug their fics and derail the conversation, then you have every right to enforce the "no pimping/promoting" policy within a discussion topic. These will be isolated incidents, however. I understand the fears, but I can assure you with well over a decade of experience under my belt backing this claim, that veteran users are more than capable of policing themselves and if we allow a blanket policy, we will not abuse it. We know our boundaries. You don't want to scare off the new users. Leave the rules simple. If they have questions, open a dialogue with them. Invite open discussion and questions. The rest will sort itself out.