Essentially the report system is a god's gift to us moderators. Many people don't realise it, but it's the first line of defense a moderator has to safeguard the forums from issues, and allows him to act swift and fast, as he gets to see the report fairly easy. It's why we encourage members to use it. I have deep respect for members who consistently do this; they essentially help with the moderating through this way.
It's like Zonk said: report it. If you want to reply on something, but feel it's off topic, then use the message box at the report page to specifically note you want to reply on it. This essentially ensures we don't remove the discussion, but move it to somewhere more appropiate (sometimes we remove, sometimes we move. It's about the moment how we judge the discussion, but once asked we'll keep it). We'll personally PM the person who reported it with a link to the discussion's new place. Moving discussions has been a big succes actually. Once the discussion is at its right place, members are and feel much less restricted to answer on it. We had this with the intercooler and with the wing vibrations. Both became a high quality discussion.
Would it not be worth then moving away from subforums in general chat all together and listing race and team under the f1 group as you have done with the cars so then you can clarify further about each one and what should be discussed in each?
I'll bring it up for discussion with the other mods.
Also a note to everybody that we'll keep splitting topics to a bare minimum for now. We were a bit overwhelmed with how it went down with the members, so we'll be considerate and put the plan on the background for now, while we look for better solutions. We humbly ask that you in return try to be a bit considerate with staying on topic.