I might compile one if I get some spare time. As a general rule of thumb, though, you can report anything that you think is breaking forum rules (
http://elementscommunity.org/forum/index.php?action=rules), or the spirit of the rules. The moderators will make a decision about whether something is breaking the rules or not, and what remedy is needed if any. You can also report threads that need janitorial tasks like moving/deleting/locking/merging; this is very helpful and I would estimate that over half of the reports we get are ones like this.
Yes, there is a rule about not reporting frivolously, but that's mostly to stop people just randomly spamming the report button. Don't feel like I'm going to slap you with a warning if you're trying to make my life easier. If it makes you feel better, I occasionally give karma to people who report helpfully.
