I have already kicked someone multiple times with an offensive name, also reported him (not the best of names....)
I must say that i haven't seen multilogging or account sharing however; others may have, just not me.
On the swearing/spamming issue, i do tell people to stop IF i see them doing it (avoiding filter). Cause i just don't like. Starred out ones are cool, they do no harm; But i can't stand local swearing in the clan chat, just bugs me.
On a defensive side of the star ranked people: We're not always looking at the clan chat. We could be afk, busy with the actual game, or reading/watching other websites. I'd suggest actually Private Messaging one of them on if we do not see it; as they are generally more visible.
@ antony. Yes, small things shouldn't be too much of a problem, as a clan should have some freedom. However, actually doging the filter to say something, is against the Runescape rules anyway, same with spamming. Seeing as those two have to be enforced in general anyway, i don't see any rules which are out of the normal, or are too strict.