Quite honestly, I can't really see there's anything that unruly going on. Sure, we have potentially NSFW gifs, but those are in the off-topic forum. Sure, we have aggravating airhorns, but that joke has died down. Sure, we have applicants being asked their favorite number (mine has to be i), but that was just a slightly silly question and didn't detract from the content, in my opinion.
We've never really operated with strict guidelines and never, to my knoledge, with the deletion of posts unless they were a copy/compltely uneeded/broke a law (see skellie's assasin for hire on the old forums), and it just slightly rubs me the wrong way. Not that I'm against an on-topic and tidy discussion (I am very much in favor of that), but posts that are silly or irrelavent have always been a thing to some dgree and are a reflection of our great community. I've never seen them seriously negatively impact a discussion; a thread may get derailed occasionally but I don't know if that's grounds for deleting posts. The occasional "let's get the thread back on topic' should work just as well.
I certainly agree that discussions, especially those in serious or lore matters (scholars and mystics, diplomacy, etc) should be handled in-character and professionally to the best of our abilities. But are they not at the moment? At the risk of either overacting or bing a stick in the mud, would you mind pointing to some cases where we're getting too unruly?
That is, unless I'm out of the loop and our situation is more dire than I thought. In that case, sorry for sounding pompous

Edit: Just had a look through some forums; I agree that we should perhaps not bring noodz into an expansion request, for example. So I do see your point, and it's a good one. Part of me just wonders about the strictness of deleting posts. Probably for no reason.