Lucasfilm's endorsement of the Star Wars fan film competitions has already created a grey area that fan edits can possibly fit in. Asking them to come down on one side of the issue will probably move them to come down on the most conservative side of the issue - no fan edits.
With Lucasfilm, it all seems to be about your profile. In almost every situation I've heard of, they ony go after people who call attention to themselves. Laying low seems like the best course of action.