Tony M - Tony, Tony, Tony. You are trying to "box" this thing into too tight a container. Above all else, the common sense rule applies. Not only that but also the "reasonable man" theory. The only posts that get deleted are flaming and advertising. A little bit of "off-topic" within a thread is certainly acceptable as long as it is in good taste. Now if the thread itself is "off-topic," then we'll just move it to the Spoon.
Shall we be like the Pharisees and create a ponderous volume of rules for every conceivable infraction? No. I'm going to rely on your common sense, patience and understanding that there is a spirit to the law in addition to the letter.
That's about as well as I can explain it. Hopefully, that gives you the idea.
If you seek perfection, you will not find it here. Sorry if this disappoints you.
Regards,
John