Some of the ideas that have been bounced around, such as "A storm thread cannot be made outside of X days", honestly don't work. Many storms can be predicted over a week out (see March 8 last year), while others appear or trend poorly 36 hours before it hits. I say that a user should use their personal discretion while making a thread and should make sure that they have multiple elements backing up the event, rather than just saying the word on the street from a week out.
For me personally, I'll only make a call if I see that all signals are favorable and make sense, not if the EURO shows a storm 168 hours out. This forum has been self-moderated pretty well and it's thanks to good calls made by the thread starters, for the most part. If nobody foolishly starts a thread on a long-range storm without checking items such as Oscillation signals, Ensemble support and other meteorological mumbo-jumbo, everything should go smoothly.
That's My $.02