In case I'm not the only one who didn't realize this feature existed: If you're reading a thread and want to post a reply that really belongs under a new topic, you can do it by first selecting the "+QUOTE" button (next to the message to be quoted) and then clicking the "NEW TOPIC" button. The new topic will start, including the quoted messge from the previous thread!

It worked! I had thought that the +quote button (sounds sort of like the name of a key on a non-standard Chemnitzer!) was to quote from multiple previous posts into one post, but I haven't figured out how to make it do that.