Adam, mods, thank you very much for your continued effort to make PF a useful AND pleasant place to hang around for all users! I have two comments.
1. I have to say I really like
Welcome & Forum Rules - PentaxForums.com. It's a well designed set of community guidelines, and I'm happy to learn that you're not going to add new regulations, judging from Adam's first post.
2. How about allowing users to flag posts for various pre-defined reasons (we could start by having just "unfriendly" and "off topic"), or to oppose an existing flag which is also considered a form of flagging, with a limited frequency? Let's say one cannot flag anything for 24 hours after flagging something even if one tries to do it in a different thread. This is a variation of down-mod, but is completely separate from Like, with a limited frequency per person and with a limited scope explicitly specifying a reason from a limited set.
Resulting data could be used in many ways, for example mods could be alerted about the cumulative "off-topic" points of all posts made in the past 24 hours in a thread as a measure of outbursts of concerns. Once a threshold of e.g. 15 points or whatever is reached, mods could post something like "There are at least 15 more people who think that some posts in the past 24 hours were off topic than those who think otherwise. Mods will kindly remind people to get back to the original topic even though sometimes it's fun and useful to diverge. If necessary, useful discussions could be made in a separate thread.". This could be automated if desired though some might still want to hear from mods than bots.
Limited frequency is of course to limit the impact of abusing it to suppress an opinion or a user that one doesn't like.
Something like this might be useful for two reasons.
First, with a quantitative guideline (e.g. 15 flags for the posts made in the past 24 hours) mods don't have to spend time wondering and discussing "well this might get worse, should we intervene now?" and "this is off topic but might be OK, what do you think?" for mundane things, offloading a part of the judgment to the users. If it matters they could flag, OTOH if not enough users flag, the thread goes on without intervention. Thus moderators can spend more time on important issues that need more human considerations.
Second, this is not a complaint nor a request for disciplinary action ("user A violated the rules please do something" etc.) but just a request for a friendly reminder so users might flag more and earlier than they report now (I've never reported anything before, sorry), which might result in a timelier intervention.
This is not a new regulation as this doesn't change the administrative action (unfortunately mods have had to remind people that they need to stay friendly and whatnot in the past).