I don't see why cross-posting information, so long as it's relevant on all the boards, should be a problem. I mean, I don't have Crohn's or UC, so I'm never on their boards. Yet I've had a colonoscopy, so if they post colonoscopy info over there, I wouldn't mind seeing it here; heck I think everyone here has had one or is scheduled for one!
The whole point of this site, I thought, was the sharing of information. That doesn't happen if individual forums are close-lipped with what they know that may affect other people on other forums.