I think that because the teamers and skybasers etc sometimes don't know what they're doing is wrong, we should have a forced rule recount for new players. Whenever a player joins the server for the first time, there is a quick recap of the rules because some young kids don't read the forums. However, you should still warn them if the punishment for their current actions requires a warning just like normal. Obviously you would not need to include things like: don't hack, because everyone knows that's wrong and could get you banned.