How about adding a prominent link to the DIS Forum to the forum masthead? That seemed to help somewhat when the product showcase forum was started. Frankly, there's no way to guarantee that every member, even regular visitors will even know it exists, and that their posts won't be exempted from such a rule just because they want more people to see their DIS postings, but make a prominent enough link above, and most folks will be 'way too embarrassed to make as much of an issue about their posts being moved when a mistake is made. And there will be many, many such mistakes. No escaping it with the eclectic mix of members here.