I'm going to point out, that kind of question typically leads to "how can I skirt the rules and get away with it" discussions. Not something I'd personally recommend.

The MODs and Admins CAN ban you for anything they deem to be unfit for the server.  Should you have a disagreement with said ban, you can appeal.  Use your common sense.  If you think it's wrong, don't do it.  If you think it might get you banned even though it's not in the rules, don't do it.

EDIT:  Just becasue the CAN ban you doesn't mean they will.  Often times I've seen them give multiple warnings.  Just because they have the patience of saints doesn't mean you should test them, though.