Yep, sounds sensible. The problem is making sure the workflow makes this easy for the moderators. But the current brainstorm implementation (a home-grown solution based on midgard) doesn't (AFAICT).

Users need some clear guidance as to how to use it (not technically, but the workflow/what's expected of them/what it's for); existing problems need to be more prominent than creating new ones as that's an easier way in for users (which is why Brainstorm is better than Bugzilla).